/wp-includes/formatting.php

<?php

/**

 * Main WordPress Formatting API.

 *

 * Handles many functions for formatting output.

 *

 * @package WordPress

 */



/**

 * Replaces common plain text characters into formatted entities

 *

 * As an example,

 * <code>

 * 'cause today's effort makes it worth tomorrow's "holiday"...

 * </code>

 * Becomes:

 * <code>

 * &#8217;cause today&#8217;s effort makes it worth tomorrow&#8217;s &#8220;holiday&#8221;&#8230;

 * </code>

 * Code within certain html blocks are skipped.

 *

 * @since 0.71

 * @uses $wp_cockneyreplace Array of formatted entities for certain common phrases

 *

 * @param string $text The text to be formatted

 * @param bool $reset Set to true for unit testing. Translated patterns will reset.

 * @return string The string replaced with html entities

 */

function wptexturize($text, $reset = false) {

	global $wp_cockneyreplace;

	static $static_characters, $static_replacements, $dynamic_characters, $dynamic_replacements,

		$default_no_texturize_tags, $default_no_texturize_shortcodes, $run_texturize = true;



	// If there's nothing to do, just stop.

	if ( empty( $text ) || false === $run_texturize ) {

		return $text;

	}



	// Set up static variables. Run once only.

	if ( $reset || ! isset( $static_characters ) ) {

		/**

		 * Filter whether to skip running wptexturize().

		 *

		 * Passing false to the filter will effectively short-circuit wptexturize().

		 * returning the original text passed to the function instead.

		 *

		 * The filter runs only once, the first time wptexturize() is called.

		 *

		 * @since 4.0.0

		 *

		 * @see wptexturize()

		 *

		 * @param bool $run_texturize Whether to short-circuit wptexturize().

		 */

		$run_texturize = apply_filters( 'run_wptexturize', $run_texturize );

		if ( false === $run_texturize ) {

			return $text;

		}



		/* translators: opening curly double quote */

		$opening_quote = _x( '&#8220;', 'opening curly double quote' );

		/* translators: closing curly double quote */

		$closing_quote = _x( '&#8221;', 'closing curly double quote' );



		/* translators: apostrophe, for example in 'cause or can't */

		$apos = _x( '&#8217;', 'apostrophe' );



		/* translators: prime, for example in 9' (nine feet) */

		$prime = _x( '&#8242;', 'prime' );

		/* translators: double prime, for example in 9" (nine inches) */

		$double_prime = _x( '&#8243;', 'double prime' );



		/* translators: opening curly single quote */

		$opening_single_quote = _x( '&#8216;', 'opening curly single quote' );

		/* translators: closing curly single quote */

		$closing_single_quote = _x( '&#8217;', 'closing curly single quote' );



		/* translators: en dash */

		$en_dash = _x( '&#8211;', 'en dash' );

		/* translators: em dash */

		$em_dash = _x( '&#8212;', 'em dash' );



		$default_no_texturize_tags = array('pre', 'code', 'kbd', 'style', 'script', 'tt');

		$default_no_texturize_shortcodes = array('code');



		// if a plugin has provided an autocorrect array, use it

		if ( isset($wp_cockneyreplace) ) {

			$cockney = array_keys($wp_cockneyreplace);

			$cockneyreplace = array_values($wp_cockneyreplace);

		} elseif ( "'" != $apos ) { // Only bother if we're doing a replacement.

			$cockney = array( "'tain't", "'twere", "'twas", "'tis", "'twill", "'til", "'bout", "'nuff", "'round", "'cause" );

			$cockneyreplace = array( $apos . "tain" . $apos . "t", $apos . "twere", $apos . "twas", $apos . "tis", $apos . "twill", $apos . "til", $apos . "bout", $apos . "nuff", $apos . "round", $apos . "cause" );

		} else {

			$cockney = $cockneyreplace = array();

		}



		$static_characters = array_merge( array( '...', '``', '\'\'', ' (tm)' ), $cockney );

		$static_replacements = array_merge( array( '&#8230;', $opening_quote, $closing_quote, ' &#8482;' ), $cockneyreplace );





		// Pattern-based replacements of characters.

		// Sort the remaining patterns into several arrays for performance tuning.

		$dynamic_characters = array( 'apos' => array(), 'quote' => array(), 'dash' => array() );

		$dynamic_replacements = array( 'apos' => array(), 'quote' => array(), 'dash' => array() );

		$dynamic = array();

		$spaces = wp_spaces_regexp();



		// '99' and '99" are ambiguous among other patterns; assume it's an abbreviated year at the end of a quotation.

		if ( "'" !== $apos || "'" !== $closing_single_quote ) {

			$dynamic[ '/\'(\d\d)\'(?=\Z|[.,)}\-\]]|&gt;|' . $spaces . ')/' ] = $apos . '$1' . $closing_single_quote;

		}

		if ( "'" !== $apos || '"' !== $closing_quote ) {

			$dynamic[ '/\'(\d\d)"(?=\Z|[.,)}\-\]]|&gt;|' . $spaces . ')/' ] = $apos . '$1' . $closing_quote;

		}



		// '99 '99s '99's (apostrophe)  But never '9 or '99% or '999 or '99.0.

		if ( "'" !== $apos ) {

			$dynamic[ '/\'(?=\d\d(?:\Z|(?![%\d]|[.,]\d)))/' ] = $apos;

		}



		// Quoted Numbers like '0.42'

		if ( "'" !== $opening_single_quote && "'" !== $closing_single_quote ) {

			$dynamic[ '/(?<=\A|' . $spaces . ')\'(\d[.,\d]*)\'/' ] = $opening_single_quote . '$1' . $closing_single_quote;

		}



		// Single quote at start, or preceded by (, {, <, [, ", -, or spaces.

		if ( "'" !== $opening_single_quote ) {

			$dynamic[ '/(?<=\A|[([{"\-]|&lt;|' . $spaces . ')\'/' ] = $opening_single_quote;

		}



		// Apostrophe in a word.  No spaces, double apostrophes, or other punctuation.

		if ( "'" !== $apos ) {

			$dynamic[ '/(?<!' . $spaces . ')\'(?!\Z|[.,:;"\'(){}[\]\-]|&[lg]t;|' . $spaces . ')/' ] = $apos;

		}



		// 9' (prime)

		if ( "'" !== $prime ) {

			$dynamic[ '/(?<=\d)\'/' ] = $prime;

		}



		// Single quotes followed by spaces or ending punctuation.

		if ( "'" !== $closing_single_quote ) {

			$dynamic[ '/\'(?=\Z|[.,)}\-\]]|&gt;|' . $spaces . ')/' ] = $closing_single_quote;

		}



		$dynamic_characters['apos'] = array_keys( $dynamic );

		$dynamic_replacements['apos'] = array_values( $dynamic );

		$dynamic = array();



		// Quoted Numbers like "42"

		if ( '"' !== $opening_quote && '"' !== $closing_quote ) {

			$dynamic[ '/(?<=\A|' . $spaces . ')"(\d[.,\d]*)"/' ] = $opening_quote . '$1' . $closing_quote;

		}



		// 9" (double prime)

		if ( '"' !== $double_prime ) {

			$dynamic[ '/(?<=\d)"/' ] = $double_prime;

		}



		// Double quote at start, or preceded by (, {, <, [, -, or spaces, and not followed by spaces.

		if ( '"' !== $opening_quote ) {

			$dynamic[ '/(?<=\A|[([{\-]|&lt;|' . $spaces . ')"(?!' . $spaces . ')/' ] = $opening_quote;

		}



		// Any remaining double quotes.

		if ( '"' !== $closing_quote ) {

			$dynamic[ '/"/' ] = $closing_quote;

		}



		$dynamic_characters['quote'] = array_keys( $dynamic );

		$dynamic_replacements['quote'] = array_values( $dynamic );

		$dynamic = array();



		// Dashes and spaces

		$dynamic[ '/---/' ] = $em_dash;

		$dynamic[ '/(?<=' . $spaces . ')--(?=' . $spaces . ')/' ] = $em_dash;

		$dynamic[ '/(?<!xn)--/' ] = $en_dash;

		$dynamic[ '/(?<=' . $spaces . ')-(?=' . $spaces . ')/' ] = $en_dash;



		$dynamic_characters['dash'] = array_keys( $dynamic );

		$dynamic_replacements['dash'] = array_values( $dynamic );

	}



	// Must do this every time in case plugins use these filters in a context sensitive manner

	/**

	 * Filter the list of HTML elements not to texturize.

	 *

	 * @since 2.8.0

	 *

	 * @param array $default_no_texturize_tags An array of HTML element names.

	 */

	$no_texturize_tags = apply_filters( 'no_texturize_tags', $default_no_texturize_tags );

	/**

	 * Filter the list of shortcodes not to texturize.

	 *

	 * @since 2.8.0

	 *

	 * @param array $default_no_texturize_shortcodes An array of shortcode names.

	 */

	$no_texturize_shortcodes = apply_filters( 'no_texturize_shortcodes', $default_no_texturize_shortcodes );



	$no_texturize_tags_stack = array();

	$no_texturize_shortcodes_stack = array();



	// Look for shortcodes and HTML elements.



	$regex =  '/('			// Capture the entire match.

		.	'<'		// Find start of element.

		.	'(?(?=!--)'	// Is this a comment?

		.		'.+?--\s*>'	// Find end of comment

		.	'|'

		.		'[^>]+>'	// Find end of element

		.	')'

		. '|'

		.	'\['		// Find start of shortcode.

		.	'\[?'		// Shortcodes may begin with [[

		.	'(?:'

		.		'[^\[\]<>]'	// Shortcodes do not contain other shortcodes.

		.	'|'

		.		'<[^>]+>' 	// HTML elements permitted. Prevents matching ] before >.

		.	')++'

		.	'\]'		// Find end of shortcode.

		.	'\]?'		// Shortcodes may end with ]]

		. ')/s';



	$textarr = preg_split( $regex, $text, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );



	foreach ( $textarr as &$curl ) {

		// Only call _wptexturize_pushpop_element if $curl is a delimiter.

		$first = $curl[0];

		if ( '<' === $first && '>' === substr( $curl, -1 ) ) {

			// This is an HTML delimiter.



			if ( '<!--' !== substr( $curl, 0, 4 ) ) {

				_wptexturize_pushpop_element( $curl, $no_texturize_tags_stack, $no_texturize_tags );

			}



		} elseif ( '' === trim( $curl ) ) {

			// This is a newline between delimiters.  Performance improves when we check this.



			continue;



		} elseif ( '[' === $first && 1 === preg_match( '/^\[(?:[^\[\]<>]|<[^>]+>)++\]$/', $curl ) ) {

			// This is a shortcode delimiter.



			_wptexturize_pushpop_element( $curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes );



		} elseif ( '[' === $first && 1 === preg_match( '/^\[\[?(?:[^\[\]<>]|<[^>]+>)++\]\]?$/', $curl ) ) {

			// This is an escaped shortcode delimiter.



			// Do not texturize.

			// Do not push to the shortcodes stack.



			continue;



		} elseif ( empty( $no_texturize_shortcodes_stack ) && empty( $no_texturize_tags_stack ) ) {

			// This is neither a delimiter, nor is this content inside of no_texturize pairs.  Do texturize.



			$curl = str_replace( $static_characters, $static_replacements, $curl );



			if ( false !== strpos( $curl, "'" ) ) {

				$curl = preg_replace( $dynamic_characters['apos'], $dynamic_replacements['apos'], $curl );

			}

			if ( false !== strpos( $curl, '"' ) ) {

				$curl = preg_replace( $dynamic_characters['quote'], $dynamic_replacements['quote'], $curl );

			}

			if ( false !== strpos( $curl, '-' ) ) {

				$curl = preg_replace( $dynamic_characters['dash'], $dynamic_replacements['dash'], $curl );

			}



			// 9x9 (times), but never 0x9999

			if ( 1 === preg_match( '/(?<=\d)x-?\d/', $curl ) ) {

				// Searching for a digit is 10 times more expensive than for the x, so we avoid doing this one!

				$curl = preg_replace( '/\b(\d(?(?<=0)[\d\.,]+|[\d\.,]*))x(-?\d[\d\.,]*)\b/', '$1&#215;$2', $curl );

			}

		}

	}

	$text = implode( '', $textarr );



	// Replace each & with &#038; unless it already looks like an entity.

	$text = preg_replace('/&(?!#(?:\d+|x[a-f0-9]+);|[a-z1-4]{1,8};)/i', '&#038;', $text);



	return $text;

}



/**

 * Search for disabled element tags. Push element to stack on tag open and pop

 * on tag close.

 *

 * Assumes first char of $text is tag opening and last char is tag closing.

 * Assumes second char of $text is optionally '/' to indicate closing as in </html>.

 *

 * @since 2.9.0

 * @access private

 *

 * @param string $text Text to check. Must be a tag like <html> or [shortcode].

 * @param array $stack List of open tag elements.

 * @param array $disabled_elements The tag names to match against. Spaces are not allowed in tag names.

 */

function _wptexturize_pushpop_element($text, &$stack, $disabled_elements) {

	// Is it an opening tag or closing tag?

	if ( '/' !== $text[1] ) {

		$opening_tag = true;

		$name_offset = 1;

	} elseif ( 0 == count( $stack ) ) {

		// Stack is empty. Just stop.

		return;

	} else {

		$opening_tag = false;

		$name_offset = 2;

	}



	// Parse out the tag name.

	$space = strpos( $text, ' ' );

	if ( FALSE === $space ) {

		$space = -1;

	} else {

		$space -= $name_offset;

	}

	$tag = substr( $text, $name_offset, $space );



	// Handle disabled tags.

	if ( in_array( $tag, $disabled_elements ) ) {

		if ( $opening_tag ) {

			/*

			 * This disables texturize until we find a closing tag of our type

			 * (e.g. <pre>) even if there was invalid nesting before that

			 *

			 * Example: in the case <pre>sadsadasd</code>"baba"</pre>

			 *          "baba" won't be texturize

			 */



			array_push( $stack, $tag );

		} elseif ( end( $stack ) == $tag ) {

			array_pop( $stack );

		}

	}

}



/**

 * Replaces double line-breaks with paragraph elements.

 *

 * A group of regex replaces used to identify text formatted with newlines and

 * replace double line-breaks with HTML paragraph tags. The remaining

 * line-breaks after conversion become <<br />> tags, unless $br is set to '0'

 * or 'false'.

 *

 * @since 0.71

 *

 * @param string $pee The text which has to be formatted.

 * @param bool $br Optional. If set, this will convert all remaining line-breaks after paragraphing. Default true.

 * @return string Text which has been converted into correct paragraph tags.

 */

function wpautop($pee, $br = true) {

	$pre_tags = array();



	if ( trim($pee) === '' )

		return '';



	$pee = $pee . "\n"; // just to make things a little easier, pad the end



	if ( strpos($pee, '<pre') !== false ) {

		$pee_parts = explode( '</pre>', $pee );

		$last_pee = array_pop($pee_parts);

		$pee = '';

		$i = 0;



		foreach ( $pee_parts as $pee_part ) {

			$start = strpos($pee_part, '<pre');



			// Malformed html?

			if ( $start === false ) {

				$pee .= $pee_part;

				continue;

			}



			$name = "<pre wp-pre-tag-$i></pre>";

			$pre_tags[$name] = substr( $pee_part, $start ) . '</pre>';



			$pee .= substr( $pee_part, 0, $start ) . $name;

			$i++;

		}



		$pee .= $last_pee;

	}



	$pee = preg_replace('|<br />\s*<br />|', "\n\n", $pee);

	// Space things out a little

	$allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|form|map|area|blockquote|address|math|style|p|h[1-6]|hr|fieldset|legend|section|article|aside|hgroup|header|footer|nav|figure|details|menu|summary)';

	$pee = preg_replace('!(<' . $allblocks . '[^>]*>)!', "\n$1", $pee);

	$pee = preg_replace('!(</' . $allblocks . '>)!', "$1\n\n", $pee);

	$pee = str_replace(array("\r\n", "\r"), "\n", $pee); // cross-platform newlines



	if ( strpos( $pee, '<option' ) !== false ) {

		// no P/BR around option

		$pee = preg_replace( '|\s*<option|', '<option', $pee );

		$pee = preg_replace( '|</option>\s*|', '</option>', $pee );

	}



	if ( strpos( $pee, '</object>' ) !== false ) {

		// no P/BR around param and embed

		$pee = preg_replace( '|(<object[^>]*>)\s*|', '$1', $pee );

		$pee = preg_replace( '|\s*</object>|', '</object>', $pee );

		$pee = preg_replace( '%\s*(</?(?:param|embed)[^>]*>)\s*%', '$1', $pee );

	}



	if ( strpos( $pee, '<source' ) !== false || strpos( $pee, '<track' ) !== false ) {

		// no P/BR around source and track

		$pee = preg_replace( '%([<\[](?:audio|video)[^>\]]*[>\]])\s*%', '$1', $pee );

		$pee = preg_replace( '%\s*([<\[]/(?:audio|video)[>\]])%', '$1', $pee );

		$pee = preg_replace( '%\s*(<(?:source|track)[^>]*>)\s*%', '$1', $pee );

	}



	$pee = preg_replace("/\n\n+/", "\n\n", $pee); // take care of duplicates

	// make paragraphs, including one at the end

	$pees = preg_split('/\n\s*\n/', $pee, -1, PREG_SPLIT_NO_EMPTY);

	$pee = '';



	foreach ( $pees as $tinkle ) {

		$pee .= '<p>' . trim($tinkle, "\n") . "</p>\n";

	}



	$pee = preg_replace('|<p>\s*</p>|', '', $pee); // under certain strange conditions it could create a P of entirely whitespace

	$pee = preg_replace('!<p>([^<]+)</(div|address|form)>!', "<p>$1</p></$2>", $pee);

	$pee = preg_replace('!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', "$1", $pee); // don't pee all over a tag

	$pee = preg_replace("|<p>(<li.+?)</p>|", "$1", $pee); // problem with nested lists

	$pee = preg_replace('|<p><blockquote([^>]*)>|i', "<blockquote$1><p>", $pee);

	$pee = str_replace('</blockquote></p>', '</p></blockquote>', $pee);

	$pee = preg_replace('!<p>\s*(</?' . $allblocks . '[^>]*>)!', "$1", $pee);

	$pee = preg_replace('!(</?' . $allblocks . '[^>]*>)\s*</p>!', "$1", $pee);



	if ( $br ) {

		$pee = preg_replace_callback('/<(script|style).*?<\/\\1>/s', '_autop_newline_preservation_helper', $pee);

		$pee = preg_replace('|(?<!<br />)\s*\n|', "<br />\n", $pee); // optionally make line breaks

		$pee = str_replace('<WPPreserveNewline />', "\n", $pee);

	}



	$pee = preg_replace('!(</?' . $allblocks . '[^>]*>)\s*<br />!', "$1", $pee);

	$pee = preg_replace('!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $pee);

	$pee = preg_replace( "|\n</p>$|", '</p>', $pee );



	if ( !empty($pre_tags) )

		$pee = str_replace(array_keys($pre_tags), array_values($pre_tags), $pee);



	return $pee;

}



/**

 * Newline preservation help function for wpautop

 *

 * @since 3.1.0

 * @access private

 *

 * @param array $matches preg_replace_callback matches array

 * @return string

 */

function _autop_newline_preservation_helper( $matches ) {

	return str_replace("\n", "<WPPreserveNewline />", $matches[0]);

}



/**

 * Don't auto-p wrap shortcodes that stand alone

 *

 * Ensures that shortcodes are not wrapped in <<p>>...<</p>>.

 *

 * @since 2.9.0

 *

 * @param string $pee The content.

 * @return string The filtered content.

 */

function shortcode_unautop( $pee ) {

	global $shortcode_tags;



	if ( empty( $shortcode_tags ) || !is_array( $shortcode_tags ) ) {

		return $pee;

	}



	$tagregexp = join( '|', array_map( 'preg_quote', array_keys( $shortcode_tags ) ) );

	$spaces = wp_spaces_regexp();



	$pattern =

		  '/'

		. '<p>'                              // Opening paragraph

		. '(?:' . $spaces . ')*+'            // Optional leading whitespace

		. '('                                // 1: The shortcode

		.     '\\['                          // Opening bracket

		.     "($tagregexp)"                 // 2: Shortcode name

		.     '(?![\\w-])'                   // Not followed by word character or hyphen

		                                     // Unroll the loop: Inside the opening shortcode tag

		.     '[^\\]\\/]*'                   // Not a closing bracket or forward slash

		.     '(?:'

		.         '\\/(?!\\])'               // A forward slash not followed by a closing bracket

		.         '[^\\]\\/]*'               // Not a closing bracket or forward slash

		.     ')*?'

		.     '(?:'

		.         '\\/\\]'                   // Self closing tag and closing bracket

		.     '|'

		.         '\\]'                      // Closing bracket

		.         '(?:'                      // Unroll the loop: Optionally, anything between the opening and closing shortcode tags

		.             '[^\\[]*+'             // Not an opening bracket

		.             '(?:'

		.                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag

		.                 '[^\\[]*+'         // Not an opening bracket

		.             ')*+'

		.             '\\[\\/\\2\\]'         // Closing shortcode tag

		.         ')?'

		.     ')'

		. ')'

		. '(?:' . $spaces . ')*+'            // optional trailing whitespace

		. '<\\/p>'                           // closing paragraph

		. '/s';



	return preg_replace( $pattern, '$1', $pee );

}



/**

 * Checks to see if a string is utf8 encoded.

 *

 * NOTE: This function checks for 5-Byte sequences, UTF8

 *       has Bytes Sequences with a maximum length of 4.

 *

 * @author bmorel at ssi dot fr (modified)

 * @since 1.2.1

 *

 * @param string $str The string to be checked

 * @return bool True if $str fits a UTF-8 model, false otherwise.

 */

function seems_utf8($str) {

	mbstring_binary_safe_encoding();

	$length = strlen($str);

	reset_mbstring_encoding();

	for ($i=0; $i < $length; $i++) {

		$c = ord($str[$i]);

		if ($c < 0x80) $n = 0; # 0bbbbbbb

		elseif (($c & 0xE0) == 0xC0) $n=1; # 110bbbbb

		elseif (($c & 0xF0) == 0xE0) $n=2; # 1110bbbb

		elseif (($c & 0xF8) == 0xF0) $n=3; # 11110bbb

		elseif (($c & 0xFC) == 0xF8) $n=4; # 111110bb

		elseif (($c & 0xFE) == 0xFC) $n=5; # 1111110b

		else return false; # Does not match any model

		for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ?

			if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))

				return false;

		}

	}

	return true;

}



/**

 * Converts a number of special characters into their HTML entities.

 *

 * Specifically deals with: &, <, >, ", and '.

 *

 * $quote_style can be set to ENT_COMPAT to encode " to

 * &quot;, or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.

 *

 * @since 1.2.2

 * @access private

 *

 * @param string $string The text which is to be encoded.

 * @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.

 * @param string $charset Optional. The character encoding of the string. Default is false.

 * @param boolean $double_encode Optional. Whether to encode existing html entities. Default is false.

 * @return string The encoded text with HTML entities.

 */

function _wp_specialchars( $string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) {

	$string = (string) $string;



	if ( 0 === strlen( $string ) )

		return '';



	// Don't bother if there are no specialchars - saves some processing

	if ( ! preg_match( '/[&<>"\']/', $string ) )

		return $string;



	// Account for the previous behaviour of the function when the $quote_style is not an accepted value

	if ( empty( $quote_style ) )

		$quote_style = ENT_NOQUOTES;

	elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) )

		$quote_style = ENT_QUOTES;



	// Store the site charset as a static to avoid multiple calls to wp_load_alloptions()

	if ( ! $charset ) {

		static $_charset;

		if ( ! isset( $_charset ) ) {

			$alloptions = wp_load_alloptions();

			$_charset = isset( $alloptions['blog_charset'] ) ? $alloptions['blog_charset'] : '';

		}

		$charset = $_charset;

	}



	if ( in_array( $charset, array( 'utf8', 'utf-8', 'UTF8' ) ) )

		$charset = 'UTF-8';



	$_quote_style = $quote_style;



	if ( $quote_style === 'double' ) {

		$quote_style = ENT_COMPAT;

		$_quote_style = ENT_COMPAT;

	} elseif ( $quote_style === 'single' ) {

		$quote_style = ENT_NOQUOTES;

	}



	// Handle double encoding ourselves

	if ( $double_encode ) {

		$string = @htmlspecialchars( $string, $quote_style, $charset );

	} else {

		// Decode &amp; into &

		$string = wp_specialchars_decode( $string, $_quote_style );



		// Guarantee every &entity; is valid or re-encode the &

		$string = wp_kses_normalize_entities( $string );



		// Now re-encode everything except &entity;

		$string = preg_split( '/(&#?x?[0-9a-z]+;)/i', $string, -1, PREG_SPLIT_DELIM_CAPTURE );



		for ( $i = 0; $i < count( $string ); $i += 2 )

			$string[$i] = @htmlspecialchars( $string[$i], $quote_style, $charset );



		$string = implode( '', $string );

	}



	// Backwards compatibility

	if ( 'single' === $_quote_style )

		$string = str_replace( "'", '&#039;', $string );



	return $string;

}



/**

 * Converts a number of HTML entities into their special characters.

 *

 * Specifically deals with: &, <, >, ", and '.

 *

 * $quote_style can be set to ENT_COMPAT to decode " entities,

 * or ENT_QUOTES to do both " and '. Default is ENT_NOQUOTES where no quotes are decoded.

 *

 * @since 2.8.0

 *

 * @param string $string The text which is to be decoded.

 * @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old _wp_specialchars() values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.

 * @return string The decoded text without HTML entities.

 */

function wp_specialchars_decode( $string, $quote_style = ENT_NOQUOTES ) {

	$string = (string) $string;



	if ( 0 === strlen( $string ) ) {

		return '';

	}



	// Don't bother if there are no entities - saves a lot of processing

	if ( strpos( $string, '&' ) === false ) {

		return $string;

	}



	// Match the previous behaviour of _wp_specialchars() when the $quote_style is not an accepted value

	if ( empty( $quote_style ) ) {

		$quote_style = ENT_NOQUOTES;

	} elseif ( !in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {

		$quote_style = ENT_QUOTES;

	}



	// More complete than get_html_translation_table( HTML_SPECIALCHARS )

	$single = array( '&#039;'  => '\'', '&#x27;' => '\'' );

	$single_preg = array( '/&#0*39;/'  => '&#039;', '/&#x0*27;/i' => '&#x27;' );

	$double = array( '&quot;' => '"', '&#034;'  => '"', '&#x22;' => '"' );

	$double_preg = array( '/&#0*34;/'  => '&#034;', '/&#x0*22;/i' => '&#x22;' );

	$others = array( '&lt;'   => '<', '&#060;'  => '<', '&gt;'   => '>', '&#062;'  => '>', '&amp;'  => '&', '&#038;'  => '&', '&#x26;' => '&' );

	$others_preg = array( '/&#0*60;/'  => '&#060;', '/&#0*62;/'  => '&#062;', '/&#0*38;/'  => '&#038;', '/&#x0*26;/i' => '&#x26;' );



	if ( $quote_style === ENT_QUOTES ) {

		$translation = array_merge( $single, $double, $others );

		$translation_preg = array_merge( $single_preg, $double_preg, $others_preg );

	} elseif ( $quote_style === ENT_COMPAT || $quote_style === 'double' ) {

		$translation = array_merge( $double, $others );

		$translation_preg = array_merge( $double_preg, $others_preg );

	} elseif ( $quote_style === 'single' ) {

		$translation = array_merge( $single, $others );

		$translation_preg = array_merge( $single_preg, $others_preg );

	} elseif ( $quote_style === ENT_NOQUOTES ) {

		$translation = $others;

		$translation_preg = $others_preg;

	}



	// Remove zero padding on numeric entities

	$string = preg_replace( array_keys( $translation_preg ), array_values( $translation_preg ), $string );



	// Replace characters according to translation table

	return strtr( $string, $translation );

}



/**

 * Checks for invalid UTF8 in a string.

 *

 * @since 2.8.0

 *

 * @param string $string The text which is to be checked.

 * @param boolean $strip Optional. Whether to attempt to strip out invalid UTF8. Default is false.

 * @return string The checked text.

 */

function wp_check_invalid_utf8( $string, $strip = false ) {

	$string = (string) $string;



	if ( 0 === strlen( $string ) ) {

		return '';

	}



	// Store the site charset as a static to avoid multiple calls to get_option()

	static $is_utf8;

	if ( !isset( $is_utf8 ) ) {

		$is_utf8 = in_array( get_option( 'blog_charset' ), array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) );

	}

	if ( !$is_utf8 ) {

		return $string;

	}



	// Check for support for utf8 in the installed PCRE library once and store the result in a static

	static $utf8_pcre;

	if ( !isset( $utf8_pcre ) ) {

		$utf8_pcre = @preg_match( '/^./u', 'a' );

	}

	// We can't demand utf8 in the PCRE installation, so just return the string in those cases

	if ( !$utf8_pcre ) {

		return $string;

	}



	// preg_match fails when it encounters invalid UTF8 in $string

	if ( 1 === @preg_match( '/^./us', $string ) ) {

		return $string;

	}



	// Attempt to strip the bad chars if requested (not recommended)

	if ( $strip && function_exists( 'iconv' ) ) {

		return iconv( 'utf-8', 'utf-8', $string );

	}



	return '';

}



/**

 * Encode the Unicode values to be used in the URI.

 *

 * @since 1.5.0

 *

 * @param string $utf8_string

 * @param int $length Max length of the string

 * @return string String with Unicode encoded for URI.

 */

function utf8_uri_encode( $utf8_string, $length = 0 ) {

	$unicode = '';

	$values = array();

	$num_octets = 1;

	$unicode_length = 0;



	mbstring_binary_safe_encoding();

	$string_length = strlen( $utf8_string );

	reset_mbstring_encoding();



	for ($i = 0; $i < $string_length; $i++ ) {



		$value = ord( $utf8_string[ $i ] );



		if ( $value < 128 ) {

			if ( $length && ( $unicode_length >= $length ) )

				break;

			$unicode .= chr($value);

			$unicode_length++;

		} else {

			if ( count( $values ) == 0 ) $num_octets = ( $value < 224 ) ? 2 : 3;



			$values[] = $value;



			if ( $length && ( $unicode_length + ($num_octets * 3) ) > $length )

				break;

			if ( count( $values ) == $num_octets ) {

				if ($num_octets == 3) {

					$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]) . '%' . dechex($values[2]);

					$unicode_length += 9;

				} else {

					$unicode .= '%' . dechex($values[0]) . '%' . dechex($values[1]);

					$unicode_length += 6;

				}



				$values = array();

				$num_octets = 1;

			}

		}

	}



	return $unicode;

}



/**

 * Converts all accent characters to ASCII characters.

 *

 * If there are no accent characters, then the string given is just returned.

 *

 * @since 1.2.1

 *

 * @param string $string Text that might have accent characters

 * @return string Filtered string with replaced "nice" characters.

 */

function remove_accents($string) {

	if ( !preg_match('/[\x80-\xff]/', $string) )

		return $string;



	if (seems_utf8($string)) {

		$chars = array(

		// Decompositions for Latin-1 Supplement

		chr(194).chr(170) => 'a', chr(194).chr(186) => 'o',

		chr(195).chr(128) => 'A', chr(195).chr(129) => 'A',

		chr(195).chr(130) => 'A', chr(195).chr(131) => 'A',

		chr(195).chr(132) => 'A', chr(195).chr(133) => 'A',

		chr(195).chr(134) => 'AE',chr(195).chr(135) => 'C',

		chr(195).chr(136) => 'E', chr(195).chr(137) => 'E',

		chr(195).chr(138) => 'E', chr(195).chr(139) => 'E',

		chr(195).chr(140) => 'I', chr(195).chr(141) => 'I',

		chr(195).chr(142) => 'I', chr(195).chr(143) => 'I',

		chr(195).chr(144) => 'D', chr(195).chr(145) => 'N',

		chr(195).chr(146) => 'O', chr(195).chr(147) => 'O',

		chr(195).chr(148) => 'O', chr(195).chr(149) => 'O',

		chr(195).chr(150) => 'O', chr(195).chr(153) => 'U',

		chr(195).chr(154) => 'U', chr(195).chr(155) => 'U',

		chr(195).chr(156) => 'U', chr(195).chr(157) => 'Y',

		chr(195).chr(158) => 'TH',chr(195).chr(159) => 's',

		chr(195).chr(160) => 'a', chr(195).chr(161) => 'a',

		chr(195).chr(162) => 'a', chr(195).chr(163) => 'a',

		chr(195).chr(164) => 'a', chr(195).chr(165) => 'a',

		chr(195).chr(166) => 'ae',chr(195).chr(167) => 'c',

		chr(195).chr(168) => 'e', chr(195).chr(169) => 'e',

		chr(195).chr(170) => 'e', chr(195).chr(171) => 'e',

		chr(195).chr(172) => 'i', chr(195).chr(173) => 'i',

		chr(195).chr(174) => 'i', chr(195).chr(175) => 'i',

		chr(195).chr(176) => 'd', chr(195).chr(177) => 'n',

		chr(195).chr(178) => 'o', chr(195).chr(179) => 'o',

		chr(195).chr(180) => 'o', chr(195).chr(181) => 'o',

		chr(195).chr(182) => 'o', chr(195).chr(184) => 'o',

		chr(195).chr(185) => 'u', chr(195).chr(186) => 'u',

		chr(195).chr(187) => 'u', chr(195).chr(188) => 'u',

		chr(195).chr(189) => 'y', chr(195).chr(190) => 'th',

		chr(195).chr(191) => 'y', chr(195).chr(152) => 'O',

		// Decompositions for Latin Extended-A

		chr(196).chr(128) => 'A', chr(196).chr(129) => 'a',

		chr(196).chr(130) => 'A', chr(196).chr(131) => 'a',

		chr(196).chr(132) => 'A', chr(196).chr(133) => 'a',

		chr(196).chr(134) => 'C', chr(196).chr(135) => 'c',

		chr(196).chr(136) => 'C', chr(196).chr(137) => 'c',

		chr(196).chr(138) => 'C', chr(196).chr(139) => 'c',

		chr(196).chr(140) => 'C', chr(196).chr(141) => 'c',

		chr(196).chr(142) => 'D', chr(196).chr(143) => 'd',

		chr(196).chr(144) => 'D', chr(196).chr(145) => 'd',

		chr(196).chr(146) => 'E', chr(196).chr(147) => 'e',

		chr(196).chr(148) => 'E', chr(196).chr(149) => 'e',

		chr(196).chr(150) => 'E', chr(196).chr(151) => 'e',

		chr(196).chr(152) => 'E', chr(196).chr(153) => 'e',

		chr(196).chr(154) => 'E', chr(196).chr(155) => 'e',

		chr(196).chr(156) => 'G', chr(196).chr(157) => 'g',

		chr(196).chr(158) => 'G', chr(196).chr(159) => 'g',

		chr(196).chr(160) => 'G', chr(196).chr(161) => 'g',

		chr(196).chr(162) => 'G', chr(196).chr(163) => 'g',

		chr(196).chr(164) => 'H', chr(196).chr(165) => 'h',

		chr(196).chr(166) => 'H', chr(196).chr(167) => 'h',

		chr(196).chr(168) => 'I', chr(196).chr(169) => 'i',

		chr(196).chr(170) => 'I', chr(196).chr(171) => 'i',

		chr(196).chr(172) => 'I', chr(196).chr(173) => 'i',

		chr(196).chr(174) => 'I', chr(196).chr(175) => 'i',

		chr(196).chr(176) => 'I', chr(196).chr(177) => 'i',

		chr(196).chr(178) => 'IJ',chr(196).chr(179) => 'ij',

		chr(196).chr(180) => 'J', chr(196).chr(181) => 'j',

		chr(196).chr(182) => 'K', chr(196).chr(183) => 'k',

		chr(196).chr(184) => 'k', chr(196).chr(185) => 'L',

		chr(196).chr(186) => 'l', chr(196).chr(187) => 'L',

		chr(196).chr(188) => 'l', chr(196).chr(189) => 'L',

		chr(196).chr(190) => 'l', chr(196).chr(191) => 'L',

		chr(197).chr(128) => 'l', chr(197).chr(129) => 'L',

		chr(197).chr(130) => 'l', chr(197).chr(131) => 'N',

		chr(197).chr(132) => 'n', chr(197).chr(133) => 'N',

		chr(197).chr(134) => 'n', chr(197).chr(135) => 'N',

		chr(197).chr(136) => 'n', chr(197).chr(137) => 'N',

		chr(197).chr(138) => 'n', chr(197).chr(139) => 'N',

		chr(197).chr(140) => 'O', chr(197).chr(141) => 'o',

		chr(197).chr(142) => 'O', chr(197).chr(143) => 'o',

		chr(197).chr(144) => 'O', chr(197).chr(145) => 'o',

		chr(197).chr(146) => 'OE',chr(197).chr(147) => 'oe',

		chr(197).chr(148) => 'R',chr(197).chr(149) => 'r',

		chr(197).chr(150) => 'R',chr(197).chr(151) => 'r',

		chr(197).chr(152) => 'R',chr(197).chr(153) => 'r',

		chr(197).chr(154) => 'S',chr(197).chr(155) => 's',

		chr(197).chr(156) => 'S',chr(197).chr(157) => 's',

		chr(197).chr(158) => 'S',chr(197).chr(159) => 's',

		chr(197).chr(160) => 'S', chr(197).chr(161) => 's',

		chr(197).chr(162) => 'T', chr(197).chr(163) => 't',

		chr(197).chr(164) => 'T', chr(197).chr(165) => 't',

		chr(197).chr(166) => 'T', chr(197).chr(167) => 't',

		chr(197).chr(168) => 'U', chr(197).chr(169) => 'u',

		chr(197).chr(170) => 'U', chr(197).chr(171) => 'u',

		chr(197).chr(172) => 'U', chr(197).chr(173) => 'u',

		chr(197).chr(174) => 'U', chr(197).chr(175) => 'u',

		chr(197).chr(176) => 'U', chr(197).chr(177) => 'u',

		chr(197).chr(178) => 'U', chr(197).chr(179) => 'u',

		chr(197).chr(180) => 'W', chr(197).chr(181) => 'w',

		chr(197).chr(182) => 'Y', chr(197).chr(183) => 'y',

		chr(197).chr(184) => 'Y', chr(197).chr(185) => 'Z',

		chr(197).chr(186) => 'z', chr(197).chr(187) => 'Z',

		chr(197).chr(188) => 'z', chr(197).chr(189) => 'Z',

		chr(197).chr(190) => 'z', chr(197).chr(191) => 's',

		// Decompositions for Latin Extended-B

		chr(200).chr(152) => 'S', chr(200).chr(153) => 's',

		chr(200).chr(154) => 'T', chr(200).chr(155) => 't',

		// Euro Sign

		chr(226).chr(130).chr(172) => 'E',

		// GBP (Pound) Sign

		chr(194).chr(163) => '',

		// Vowels with diacritic (Vietnamese)

		// unmarked

		chr(198).chr(160) => 'O', chr(198).chr(161) => 'o',

		chr(198).chr(175) => 'U', chr(198).chr(176) => 'u',

		// grave accent

		chr(225).chr(186).chr(166) => 'A', chr(225).chr(186).chr(167) => 'a',

		chr(225).chr(186).chr(176) => 'A', chr(225).chr(186).chr(177) => 'a',

		chr(225).chr(187).chr(128) => 'E', chr(225).chr(187).chr(129) => 'e',

		chr(225).chr(187).chr(146) => 'O', chr(225).chr(187).chr(147) => 'o',

		chr(225).chr(187).chr(156) => 'O', chr(225).chr(187).chr(157) => 'o',

		chr(225).chr(187).chr(170) => 'U', chr(225).chr(187).chr(171) => 'u',

		chr(225).chr(187).chr(178) => 'Y', chr(225).chr(187).chr(179) => 'y',

		// hook

		chr(225).chr(186).chr(162) => 'A', chr(225).chr(186).chr(163) => 'a',

		chr(225).chr(186).chr(168) => 'A', chr(225).chr(186).chr(169) => 'a',

		chr(225).chr(186).chr(178) => 'A', chr(225).chr(186).chr(179) => 'a',

		chr(225).chr(186).chr(186) => 'E', chr(225).chr(186).chr(187) => 'e',

		chr(225).chr(187).chr(130) => 'E', chr(225).chr(187).chr(131) => 'e',

		chr(225).chr(187).chr(136) => 'I', chr(225).chr(187).chr(137) => 'i',

		chr(225).chr(187).chr(142) => 'O', chr(225).chr(187).chr(143) => 'o',

		chr(225).chr(187).chr(148) => 'O', chr(225).chr(187).chr(149) => 'o',

		chr(225).chr(187).chr(158) => 'O', chr(225).chr(187).chr(159) => 'o',

		chr(225).chr(187).chr(166) => 'U', chr(225).chr(187).chr(167) => 'u',

		chr(225).chr(187).chr(172) => 'U', chr(225).chr(187).chr(173) => 'u',

		chr(225).chr(187).chr(182) => 'Y', chr(225).chr(187).chr(183) => 'y',

		// tilde

		chr(225).chr(186).chr(170) => 'A', chr(225).chr(186).chr(171) => 'a',

		chr(225).chr(186).chr(180) => 'A', chr(225).chr(186).chr(181) => 'a',

		chr(225).chr(186).chr(188) => 'E', chr(225).chr(186).chr(189) => 'e',

		chr(225).chr(187).chr(132) => 'E', chr(225).chr(187).chr(133) => 'e',

		chr(225).chr(187).chr(150) => 'O', chr(225).chr(187).chr(151) => 'o',

		chr(225).chr(187).chr(160) => 'O', chr(225).chr(187).chr(161) => 'o',

		chr(225).chr(187).chr(174) => 'U', chr(225).chr(187).chr(175) => 'u',

		chr(225).chr(187).chr(184) => 'Y', chr(225).chr(187).chr(185) => 'y',

		// acute accent

		chr(225).chr(186).chr(164) => 'A', chr(225).chr(186).chr(165) => 'a',

		chr(225).chr(186).chr(174) => 'A', chr(225).chr(186).chr(175) => 'a',

		chr(225).chr(186).chr(190) => 'E', chr(225).chr(186).chr(191) => 'e',

		chr(225).chr(187).chr(144) => 'O', chr(225).chr(187).chr(145) => 'o',

		chr(225).chr(187).chr(154) => 'O', chr(225).chr(187).chr(155) => 'o',

		chr(225).chr(187).chr(168) => 'U', chr(225).chr(187).chr(169) => 'u',

		// dot below

		chr(225).chr(186).chr(160) => 'A', chr(225).chr(186).chr(161) => 'a',

		chr(225).chr(186).chr(172) => 'A', chr(225).chr(186).chr(173) => 'a',

		chr(225).chr(186).chr(182) => 'A', chr(225).chr(186).chr(183) => 'a',

		chr(225).chr(186).chr(184) => 'E', chr(225).chr(186).chr(185) => 'e',

		chr(225).chr(187).chr(134) => 'E', chr(225).chr(187).chr(135) => 'e',

		chr(225).chr(187).chr(138) => 'I', chr(225).chr(187).chr(139) => 'i',

		chr(225).chr(187).chr(140) => 'O', chr(225).chr(187).chr(141) => 'o',

		chr(225).chr(187).chr(152) => 'O', chr(225).chr(187).chr(153) => 'o',

		chr(225).chr(187).chr(162) => 'O', chr(225).chr(187).chr(163) => 'o',

		chr(225).chr(187).chr(164) => 'U', chr(225).chr(187).chr(165) => 'u',

		chr(225).chr(187).chr(176) => 'U', chr(225).chr(187).chr(177) => 'u',

		chr(225).chr(187).chr(180) => 'Y', chr(225).chr(187).chr(181) => 'y',

		// Vowels with diacritic (Chinese, Hanyu Pinyin)

		chr(201).chr(145) => 'a',

		// macron

		chr(199).chr(149) => 'U', chr(199).chr(150) => 'u',

		// acute accent

		chr(199).chr(151) => 'U', chr(199).chr(152) => 'u',

		// caron

		chr(199).chr(141) => 'A', chr(199).chr(142) => 'a',

		chr(199).chr(143) => 'I', chr(199).chr(144) => 'i',

		chr(199).chr(145) => 'O', chr(199).chr(146) => 'o',

		chr(199).chr(147) => 'U', chr(199).chr(148) => 'u',

		chr(199).chr(153) => 'U', chr(199).chr(154) => 'u',

		// grave accent

		chr(199).chr(155) => 'U', chr(199).chr(156) => 'u',

		);



		// Used for locale-specific rules

		$locale = get_locale();



		if ( 'de_DE' == $locale ) {

			$chars[ chr(195).chr(132) ] = 'Ae';

			$chars[ chr(195).chr(164) ] = 'ae';

			$chars[ chr(195).chr(150) ] = 'Oe';

			$chars[ chr(195).chr(182) ] = 'oe';

			$chars[ chr(195).chr(156) ] = 'Ue';

			$chars[ chr(195).chr(188) ] = 'ue';

			$chars[ chr(195).chr(159) ] = 'ss';

		} elseif ( 'da_DK' === $locale ) {

			$chars[ chr(195).chr(134) ] = 'Ae';

 			$chars[ chr(195).chr(166) ] = 'ae';

			$chars[ chr(195).chr(152) ] = 'Oe';

			$chars[ chr(195).chr(184) ] = 'oe';

			$chars[ chr(195).chr(133) ] = 'Aa';

			$chars[ chr(195).chr(165) ] = 'aa';

		}



		$string = strtr($string, $chars);

	} else {

		// Assume ISO-8859-1 if not UTF-8

		$chars['in'] = chr(128).chr(131).chr(138).chr(142).chr(154).chr(158)

			.chr(159).chr(162).chr(165).chr(181).chr(192).chr(193).chr(194)

			.chr(195).chr(196).chr(197).chr(199).chr(200).chr(201).chr(202)

			.chr(203).chr(204).chr(205).chr(206).chr(207).chr(209).chr(210)

			.chr(211).chr(212).chr(213).chr(214).chr(216).chr(217).chr(218)

			.chr(219).chr(220).chr(221).chr(224).chr(225).chr(226).chr(227)

			.chr(228).chr(229).chr(231).chr(232).chr(233).chr(234).chr(235)

			.chr(236).chr(237).chr(238).chr(239).chr(241).chr(242).chr(243)

			.chr(244).chr(245).chr(246).chr(248).chr(249).chr(250).chr(251)

			.chr(252).chr(253).chr(255);



		$chars['out'] = "EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy";



		$string = strtr($string, $chars['in'], $chars['out']);

		$double_chars['in'] = array(chr(140), chr(156), chr(198), chr(208), chr(222), chr(223), chr(230), chr(240), chr(254));

		$double_chars['out'] = array('OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th');

		$string = str_replace($double_chars['in'], $double_chars['out'], $string);

	}



	return $string;

}



/**

 * Sanitizes a filename, replacing whitespace with dashes.

 *

 * Removes special characters that are illegal in filenames on certain

 * operating systems and special characters requiring special escaping

 * to manipulate at the command line. Replaces spaces and consecutive

 * dashes with a single dash. Trims period, dash and underscore from beginning

 * and end of filename.

 *

 * @since 2.1.0

 *

 * @param string $filename The filename to be sanitized

 * @return string The sanitized filename

 */

function sanitize_file_name( $filename ) {

	$filename_raw = $filename;

	$special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "|", "~", "`", "!", "{", "}", chr(0));

	/**

	 * Filter the list of characters to remove from a filename.

	 *

	 * @since 2.8.0

	 *

	 * @param array  $special_chars Characters to remove.

	 * @param string $filename_raw  Filename as it was passed into sanitize_file_name().

	 */

	$special_chars = apply_filters( 'sanitize_file_name_chars', $special_chars, $filename_raw );

	$filename = preg_replace( "#\x{00a0}#siu", ' ', $filename );

	$filename = str_replace($special_chars, '', $filename);

	$filename = str_replace( array( '%20', '+' ), '-', $filename );

	$filename = preg_replace('/[\s-]+/', '-', $filename);

	$filename = trim($filename, '.-_');



	// Split the filename into a base and extension[s]

	$parts = explode('.', $filename);



	// Return if only one extension

	if ( count( $parts ) <= 2 ) {

		/**

		 * Filter a sanitized filename string.

		 *

		 * @since 2.8.0

		 *

		 * @param string $filename     Sanitized filename.

		 * @param string $filename_raw The filename prior to sanitization.

		 */

		return apply_filters( 'sanitize_file_name', $filename, $filename_raw );

	}



	// Process multiple extensions

	$filename = array_shift($parts);

	$extension = array_pop($parts);

	$mimes = get_allowed_mime_types();



	/*

	 * Loop over any intermediate extensions. Postfix them with a trailing underscore

	 * if they are a 2 - 5 character long alpha string not in the extension whitelist.

	 */

	foreach ( (array) $parts as $part) {

		$filename .= '.' . $part;



		if ( preg_match("/^[a-zA-Z]{2,5}\d?$/", $part) ) {

			$allowed = false;

			foreach ( $mimes as $ext_preg => $mime_match ) {

				$ext_preg = '!^(' . $ext_preg . ')$!i';

				if ( preg_match( $ext_preg, $part ) ) {

					$allowed = true;

					break;

				}

			}

			if ( !$allowed )

				$filename .= '_';

		}

	}

	$filename .= '.' . $extension;

	/** This filter is documented in wp-includes/formatting.php */

	return apply_filters('sanitize_file_name', $filename, $filename_raw);

}



/**

 * Sanitizes a username, stripping out unsafe characters.

 *

 * Removes tags, octets, entities, and if strict is enabled, will only keep

 * alphanumeric, _, space, ., -, @. After sanitizing, it passes the username,

 * raw username (the username in the parameter), and the value of $strict as

 * parameters for the 'sanitize_user' filter.

 *

 * @since 2.0.0

 *

 * @param string $username The username to be sanitized.

 * @param bool $strict If set limits $username to specific characters. Default false.

 * @return string The sanitized username, after passing through filters.

 */

function sanitize_user( $username, $strict = false ) {

	$raw_username = $username;

	$username = wp_strip_all_tags( $username );

	$username = remove_accents( $username );

	// Kill octets

	$username = preg_replace( '|%([a-fA-F0-9][a-fA-F0-9])|', '', $username );

	$username = preg_replace( '/&.+?;/', '', $username ); // Kill entities



	// If strict, reduce to ASCII for max portability.

	if ( $strict )

		$username = preg_replace( '|[^a-z0-9 _.\-@]|i', '', $username );



	$username = trim( $username );

	// Consolidate contiguous whitespace

	$username = preg_replace( '|\s+|', ' ', $username );



	/**

	 * Filter a sanitized username string.

	 *

	 * @since 2.0.1

	 *

	 * @param string $username     Sanitized username.

	 * @param string $raw_username The username prior to sanitization.

	 * @param bool   $strict       Whether to limit the sanitization to specific characters. Default false.

	 */

	return apply_filters( 'sanitize_user', $username, $raw_username, $strict );

}



/**

 * Sanitizes a string key.

 *

 * Keys are used as internal identifiers. Lowercase alphanumeric characters, dashes and underscores are allowed.

 *

 * @since 3.0.0

 *

 * @param string $key String key

 * @return string Sanitized key

 */

function sanitize_key( $key ) {

	$raw_key = $key;

	$key = strtolower( $key );

	$key = preg_replace( '/[^a-z0-9_\-]/', '', $key );



	/**

	 * Filter a sanitized key string.

	 *

	 * @since 3.0.0

	 *

	 * @param string $key     Sanitized key.

	 * @param string $raw_key The key prior to sanitization.

	 */

	return apply_filters( 'sanitize_key', $key, $raw_key );

}



/**

 * Sanitizes a title, or returns a fallback title.

 *

 * Specifically, HTML and PHP tags are stripped. Further actions can be added

 * via the plugin API. If $title is empty and $fallback_title is set, the latter

 * will be used.

 *

 * @since 1.0.0

 *

 * @param string $title The string to be sanitized.

 * @param string $fallback_title Optional. A title to use if $title is empty.

 * @param string $context Optional. The operation for which the string is sanitized

 * @return string The sanitized string.

 */

function sanitize_title( $title, $fallback_title = '', $context = 'save' ) {

	$raw_title = $title;



	if ( 'save' == $context )

		$title = remove_accents($title);



	/**

	 * Filter a sanitized title string.

	 *

	 * @since 1.2.0

	 *

	 * @param string $title     Sanitized title.

	 * @param string $raw_title The title prior to sanitization.

	 * @param string $context   The context for which the title is being sanitized.

	 */

	$title = apply_filters( 'sanitize_title', $title, $raw_title, $context );



	if ( '' === $title || false === $title )

		$title = $fallback_title;



	return $title;

}



/**

 * Sanitizes a title with the 'query' context.

 *

 * Used for querying the database for a value from URL.

 *

 * @since 3.1.0

 * @uses sanitize_title()

 *

 * @param string $title The string to be sanitized.

 * @return string The sanitized string.

 */

function sanitize_title_for_query( $title ) {

	return sanitize_title( $title, '', 'query' );

}



/**

 * Sanitizes a title, replacing whitespace and a few other characters with dashes.

 *

 * Limits the output to alphanumeric characters, underscore (_) and dash (-).

 * Whitespace becomes a dash.

 *

 * @since 1.2.0

 *

 * @param string $title The title to be sanitized.

 * @param string $raw_title Optional. Not used.

 * @param string $context Optional. The operation for which the string is sanitized.

 * @return string The sanitized title.

 */

function sanitize_title_with_dashes( $title, $raw_title = '', $context = 'display' ) {

	$title = strip_tags($title);

	// Preserve escaped octets.

	$title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);

	// Remove percent signs that are not part of an octet.

	$title = str_replace('%', '', $title);

	// Restore octets.

	$title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);



	if (seems_utf8($title)) {

		if (function_exists('mb_strtolower')) {

			$title = mb_strtolower($title, 'UTF-8');

		}

		$title = utf8_uri_encode($title, 200);

	}



	$title = strtolower($title);

	$title = preg_replace('/&.+?;/', '', $title); // kill entities

	$title = str_replace('.', '-', $title);



	if ( 'save' == $context ) {

		// Convert nbsp, ndash and mdash to hyphens

		$title = str_replace( array( '%c2%a0', '%e2%80%93', '%e2%80%94' ), '-', $title );



		// Strip these characters entirely

		$title = str_replace( array(

			// iexcl and iquest

			'%c2%a1', '%c2%bf',

			// angle quotes

			'%c2%ab', '%c2%bb', '%e2%80%b9', '%e2%80%ba',

			// curly quotes

			'%e2%80%98', '%e2%80%99', '%e2%80%9c', '%e2%80%9d',

			'%e2%80%9a', '%e2%80%9b', '%e2%80%9e', '%e2%80%9f',

			// copy, reg, deg, hellip and trade

			'%c2%a9', '%c2%ae', '%c2%b0', '%e2%80%a6', '%e2%84%a2',

			// acute accents

			'%c2%b4', '%cb%8a', '%cc%81', '%cd%81',

			// grave accent, macron, caron

			'%cc%80', '%cc%84', '%cc%8c',

		), '', $title );



		// Convert times to x

		$title = str_replace( '%c3%97', 'x', $title );

	}



	$title = preg_replace('/[^%a-z0-9 _-]/', '', $title);

	$title = preg_replace('/\s+/', '-', $title);

	$title = preg_replace('|-+|', '-', $title);

	$title = trim($title, '-');



	return $title;

}



/**

 * Ensures a string is a valid SQL order by clause.

 *

 * Accepts one or more columns, with or without ASC/DESC, and also accepts

 * RAND().

 *

 * @since 2.5.1

 *

 * @param string $orderby Order by string to be checked.

 * @return string|bool Returns the order by clause if it is a match, false otherwise.

 */

function sanitize_sql_orderby( $orderby ){

	preg_match('/^\s*([a-z0-9_]+(\s+(ASC|DESC))?(\s*,\s*|\s*$))+|^\s*RAND\(\s*\)\s*$/i', $orderby, $obmatches);

	if ( !$obmatches )

		return false;

	return $orderby;

}



/**

 * Sanitizes an HTML classname to ensure it only contains valid characters.

 *

 * Strips the string down to A-Z,a-z,0-9,_,-. If this results in an empty

 * string then it will return the alternative value supplied.

 *

 * @todo Expand to support the full range of CDATA that a class attribute can contain.

 *

 * @since 2.8.0

 *

 * @param string $class The classname to be sanitized

 * @param string $fallback Optional. The value to return if the sanitization ends up as an empty string.

 * 	Defaults to an empty string.

 * @return string The sanitized value

 */

function sanitize_html_class( $class, $fallback = '' ) {

	//Strip out any % encoded octets

	$sanitized = preg_replace( '|%[a-fA-F0-9][a-fA-F0-9]|', '', $class );



	//Limit to A-Z,a-z,0-9,_,-

	$sanitized = preg_replace( '/[^A-Za-z0-9_-]/', '', $sanitized );



	if ( '' == $sanitized )

		$sanitized = $fallback;



	/**

	 * Filter a sanitized HTML class string.

	 *

	 * @since 2.8.0

	 *

	 * @param string $sanitized The sanitized HTML class.

	 * @param string $class     HTML class before sanitization.

	 * @param string $fallback  The fallback string.

	 */

	return apply_filters( 'sanitize_html_class', $sanitized, $class, $fallback );

}



/**

 * Converts a number of characters from a string.

 *

 * Metadata tags <<title>> and <<category>> are removed, <<br>> and <<hr>> are

 * converted into correct XHTML and Unicode characters are converted to the

 * valid range.

 *

 * @since 0.71

 *

 * @param string $content String of characters to be converted.

 * @param string $deprecated Not used.

 * @return string Converted string.

 */

function convert_chars($content, $deprecated = '') {

	if ( !empty( $deprecated ) )

		_deprecated_argument( __FUNCTION__, '0.71' );



	// Translation of invalid Unicode references range to valid range

	$wp_htmltranswinuni = array(

	'&#128;' => '&#8364;', // the Euro sign

	'&#129;' => '',

	'&#130;' => '&#8218;', // these are Windows CP1252 specific characters

	'&#131;' => '&#402;',  // they would look weird on non-Windows browsers

	'&#132;' => '&#8222;',

	'&#133;' => '&#8230;',

	'&#134;' => '&#8224;',

	'&#135;' => '&#8225;',

	'&#136;' => '&#710;',

	'&#137;' => '&#8240;',

	'&#138;' => '&#352;',

	'&#139;' => '&#8249;',

	'&#140;' => '&#338;',

	'&#141;' => '',

	'&#142;' => '&#381;',

	'&#143;' => '',

	'&#144;' => '',

	'&#145;' => '&#8216;',

	'&#146;' => '&#8217;',

	'&#147;' => '&#8220;',

	'&#148;' => '&#8221;',

	'&#149;' => '&#8226;',

	'&#150;' => '&#8211;',

	'&#151;' => '&#8212;',

	'&#152;' => '&#732;',

	'&#153;' => '&#8482;',

	'&#154;' => '&#353;',

	'&#155;' => '&#8250;',

	'&#156;' => '&#339;',

	'&#157;' => '',

	'&#158;' => '&#382;',

	'&#159;' => '&#376;'

	);



	// Remove metadata tags

	$content = preg_replace('/<title>(.+?)<\/title>/','',$content);

	$content = preg_replace('/<category>(.+?)<\/category>/','',$content);



	// Converts lone & characters into &#38; (a.k.a. &amp;)

	$content = preg_replace('/&([^#])(?![a-z1-4]{1,8};)/i', '&#038;$1', $content);



	// Fix Word pasting

	$content = strtr($content, $wp_htmltranswinuni);



	// Just a little XHTML help

	$content = str_replace('<br>', '<br />', $content);

	$content = str_replace('<hr>', '<hr />', $content);



	return $content;

}



/**

 * Balances tags if forced to, or if the 'use_balanceTags' option is set to true.

 *

 * @since 0.71

 *

 * @param string $text Text to be balanced

 * @param bool $force If true, forces balancing, ignoring the value of the option. Default false.

 * @return string Balanced text

 */

function balanceTags( $text, $force = false ) {

	if ( $force || get_option('use_balanceTags') == 1 ) {

		return force_balance_tags( $text );

	} else {

		return $text;

	}

}



/**

 * Balances tags of string using a modified stack.

 *

 * @since 2.0.4

 *

 * @author Leonard Lin <leonard@acm.org>

 * @license GPL

 * @copyright November 4, 2001

 * @version 1.1

 * @todo Make better - change loop condition to $text in 1.2

 * @internal Modified by Scott Reilly (coffee2code) 02 Aug 2004

 *		1.1  Fixed handling of append/stack pop order of end text

 *			 Added Cleaning Hooks

 *		1.0  First Version

 *

 * @param string $text Text to be balanced.

 * @return string Balanced text.

 */

function force_balance_tags( $text ) {

	$tagstack = array();

	$stacksize = 0;

	$tagqueue = '';

	$newtext = '';

	// Known single-entity/self-closing tags

	$single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source' );

	// Tags that can be immediately nested within themselves

	$nestable_tags = array( 'blockquote', 'div', 'object', 'q', 'span' );



	// WP bug fix for comments - in case you REALLY meant to type '< !--'

	$text = str_replace('< !--', '<    !--', $text);

	// WP bug fix for LOVE <3 (and other situations with '<' before a number)

	$text = preg_replace('#<([0-9]{1})#', '&lt;$1', $text);



	while ( preg_match("/<(\/?[\w:]*)\s*([^>]*)>/", $text, $regex) ) {

		$newtext .= $tagqueue;



		$i = strpos($text, $regex[0]);

		$l = strlen($regex[0]);



		// clear the shifter

		$tagqueue = '';

		// Pop or Push

		if ( isset($regex[1][0]) && '/' == $regex[1][0] ) { // End Tag

			$tag = strtolower(substr($regex[1],1));

			// if too many closing tags

			if( $stacksize <= 0 ) {

				$tag = '';

				// or close to be safe $tag = '/' . $tag;

			}

			// if stacktop value = tag close value then pop

			else if ( $tagstack[$stacksize - 1] == $tag ) { // found closing tag

				$tag = '</' . $tag . '>'; // Close Tag

				// Pop

				array_pop( $tagstack );

				$stacksize--;

			} else { // closing tag not at top, search for it

				for ( $j = $stacksize-1; $j >= 0; $j-- ) {

					if ( $tagstack[$j] == $tag ) {

					// add tag to tagqueue

						for ( $k = $stacksize-1; $k >= $j; $k--) {

							$tagqueue .= '</' . array_pop( $tagstack ) . '>';

							$stacksize--;

						}

						break;

					}

				}

				$tag = '';

			}

		} else { // Begin Tag

			$tag = strtolower($regex[1]);



			// Tag Cleaning



			// If it's an empty tag "< >", do nothing

			if ( '' == $tag ) {

				// do nothing

			}

			// ElseIf it presents itself as a self-closing tag...

			elseif ( substr( $regex[2], -1 ) == '/' ) {

				// ...but it isn't a known single-entity self-closing tag, then don't let it be treated as such and

				// immediately close it with a closing tag (the tag will encapsulate no text as a result)

				if ( ! in_array( $tag, $single_tags ) )

					$regex[2] = trim( substr( $regex[2], 0, -1 ) ) . "></$tag";

			}

			// ElseIf it's a known single-entity tag but it doesn't close itself, do so

			elseif ( in_array($tag, $single_tags) ) {

				$regex[2] .= '/';

			}

			// Else it's not a single-entity tag

			else {

				// If the top of the stack is the same as the tag we want to push, close previous tag

				if ( $stacksize > 0 && !in_array($tag, $nestable_tags) && $tagstack[$stacksize - 1] == $tag ) {

					$tagqueue = '</' . array_pop( $tagstack ) . '>';

					$stacksize--;

				}

				$stacksize = array_push( $tagstack, $tag );

			}



			// Attributes

			$attributes = $regex[2];

			if( ! empty( $attributes ) && $attributes[0] != '>' )

				$attributes = ' ' . $attributes;



			$tag = '<' . $tag . $attributes . '>';

			//If already queuing a close tag, then put this tag on, too

			if ( !empty($tagqueue) ) {

				$tagqueue .= $tag;

				$tag = '';

			}

		}

		$newtext .= substr($text, 0, $i) . $tag;

		$text = substr($text, $i + $l);

	}



	// Clear Tag Queue

	$newtext .= $tagqueue;



	// Add Remaining text

	$newtext .= $text;



	// Empty Stack

	while( $x = array_pop($tagstack) )

		$newtext .= '</' . $x . '>'; // Add remaining tags to close



	// WP fix for the bug with HTML comments

	$newtext = str_replace("< !--","<!--",$newtext);

	$newtext = str_replace("<    !--","< !--",$newtext);



	return $newtext;

}



/**

 * Acts on text which is about to be edited.

 *

 * The $content is run through esc_textarea(), which uses htmlspecialchars()

 * to convert special characters to HTML entities. If $richedit is set to true,

 * it is simply a holder for the 'format_to_edit' filter.

 *

 * @since 0.71

 *

 * @param string $content The text about to be edited.

 * @param bool $richedit Whether the $content should not pass through htmlspecialchars(). Default false (meaning it will be passed).

 * @return string The text after the filter (and possibly htmlspecialchars()) has been run.

 */

function format_to_edit( $content, $richedit = false ) {

	/**

	 * Filter the text to be formatted for editing.

	 *

	 * @since 1.2.0

	 *

	 * @param string $content The text, prior to formatting for editing.

	 */

	$content = apply_filters( 'format_to_edit', $content );

	if ( ! $richedit )

		$content = esc_textarea( $content );

	return $content;

}



/**

 * Add leading zeros when necessary.

 *

 * If you set the threshold to '4' and the number is '10', then you will get

 * back '0010'. If you set the threshold to '4' and the number is '5000', then you

 * will get back '5000'.

 *

 * Uses sprintf to append the amount of zeros based on the $threshold parameter

 * and the size of the number. If the number is large enough, then no zeros will

 * be appended.

 *

 * @since 0.71

 *

 * @param mixed $number Number to append zeros to if not greater than threshold.

 * @param int $threshold Digit places number needs to be to not have zeros added.

 * @return string Adds leading zeros to number if needed.

 */

function zeroise($number, $threshold) {

	return sprintf('%0'.$threshold.'s', $number);

}



/**

 * Adds backslashes before letters and before a number at the start of a string.

 *

 * @since 0.71

 *

 * @param string $string Value to which backslashes will be added.

 * @return string String with backslashes inserted.

 */

function backslashit($string) {

	if ( isset( $string[0] ) && $string[0] >= '0' && $string[0] <= '9' )

		$string = '\\\\' . $string;

	return addcslashes( $string, 'A..Za..z' );

}



/**

 * Appends a trailing slash.

 *

 * Will remove trailing forward and backslashes if it exists already before adding

 * a trailing forward slash. This prevents double slashing a string or path.

 *

 * The primary use of this is for paths and thus should be used for paths. It is

 * not restricted to paths and offers no specific path support.

 *

 * @since 1.2.0

 *

 * @param string $string What to add the trailing slash to.

 * @return string String with trailing slash added.

 */

function trailingslashit( $string ) {

	return untrailingslashit( $string ) . '/';

}



/**

 * Removes trailing forward slashes and backslashes if they exist.

 *

 * The primary use of this is for paths and thus should be used for paths. It is

 * not restricted to paths and offers no specific path support.

 *

 * @since 2.2.0

 *

 * @param string $string What to remove the trailing slashes from.

 * @return string String without the trailing slashes.

 */

function untrailingslashit( $string ) {

	return rtrim( $string, '/\\' );

}



/**

 * Adds slashes to escape strings.

 *

 * Slashes will first be removed if magic_quotes_gpc is set, see {@link

 * http://www.php.net/magic_quotes} for more details.

 *

 * @since 0.71

 *

 * @param string $gpc The string returned from HTTP request data.

 * @return string Returns a string escaped with slashes.

 */

function addslashes_gpc($gpc) {

	if ( get_magic_quotes_gpc() )

		$gpc = stripslashes($gpc);



	return wp_slash($gpc);

}



/**

 * Navigates through an array and removes slashes from the values.

 *

 * If an array is passed, the array_map() function causes a callback to pass the

 * value back to the function. The slashes from this value will removed.

 *

 * @since 2.0.0

 *

 * @param mixed $value The value to be stripped.

 * @return mixed Stripped value.

 */

function stripslashes_deep($value) {

	if ( is_array($value) ) {

		$value = array_map('stripslashes_deep', $value);

	} elseif ( is_object($value) ) {

		$vars = get_object_vars( $value );

		foreach ($vars as $key=>$data) {

			$value->{$key} = stripslashes_deep( $data );

		}

	} elseif ( is_string( $value ) ) {

		$value = stripslashes($value);

	}



	return $value;

}



/**

 * Navigates through an array and encodes the values to be used in a URL.

 *

 *

 * @since 2.2.0

 *

 * @param array|string $value The array or string to be encoded.

 * @return array|string $value The encoded array (or string from the callback).

 */

function urlencode_deep($value) {

	$value = is_array($value) ? array_map('urlencode_deep', $value) : urlencode($value);

	return $value;

}



/**

 * Navigates through an array and raw encodes the values to be used in a URL.

 *

 * @since 3.4.0

 *

 * @param array|string $value The array or string to be encoded.

 * @return array|string $value The encoded array (or string from the callback).

 */

function rawurlencode_deep( $value ) {

	return is_array( $value ) ? array_map( 'rawurlencode_deep', $value ) : rawurlencode( $value );

}



/**

 * Converts email addresses characters to HTML entities to block spam bots.

 *

 * @since 0.71

 *

 * @param string $email_address Email address.

 * @param int $hex_encoding Optional. Set to 1 to enable hex encoding.

 * @return string Converted email address.

 */

function antispambot( $email_address, $hex_encoding = 0 ) {

	$email_no_spam_address = '';

	for ( $i = 0; $i < strlen( $email_address ); $i++ ) {

		$j = rand( 0, 1 + $hex_encoding );

		if ( $j == 0 ) {

			$email_no_spam_address .= '&#' . ord( $email_address[$i] ) . ';';

		} elseif ( $j == 1 ) {

			$email_no_spam_address .= $email_address[$i];

		} elseif ( $j == 2 ) {

			$email_no_spam_address .= '%' . zeroise( dechex( ord( $email_address[$i] ) ), 2 );

		}

	}



	$email_no_spam_address = str_replace( '@', '&#64;', $email_no_spam_address );



	return $email_no_spam_address;

}



/**

 * Callback to convert URI match to HTML A element.

 *

 * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link

 * make_clickable()}.

 *

 * @since 2.3.2

 * @access private

 *

 * @param array $matches Single Regex Match.

 * @return string HTML A element with URI address.

 */

function _make_url_clickable_cb($matches) {

	$url = $matches[2];



	if ( ')' == $matches[3] && strpos( $url, '(' ) ) {

		// If the trailing character is a closing parethesis, and the URL has an opening parenthesis in it, add the closing parenthesis to the URL.

		// Then we can let the parenthesis balancer do its thing below.

		$url .= $matches[3];

		$suffix = '';

	} else {

		$suffix = $matches[3];

	}



	// Include parentheses in the URL only if paired

	while ( substr_count( $url, '(' ) < substr_count( $url, ')' ) ) {

		$suffix = strrchr( $url, ')' ) . $suffix;

		$url = substr( $url, 0, strrpos( $url, ')' ) );

	}



	$url = esc_url($url);

	if ( empty($url) )

		return $matches[0];



	return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $suffix;

}



/**

 * Callback to convert URL match to HTML A element.

 *

 * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link

 * make_clickable()}.

 *

 * @since 2.3.2

 * @access private

 *

 * @param array $matches Single Regex Match.

 * @return string HTML A element with URL address.

 */

function _make_web_ftp_clickable_cb($matches) {

	$ret = '';

	$dest = $matches[2];

	$dest = 'http://' . $dest;

	$dest = esc_url($dest);

	if ( empty($dest) )

		return $matches[0];



	// removed trailing [.,;:)] from URL

	if ( in_array( substr($dest, -1), array('.', ',', ';', ':', ')') ) === true ) {

		$ret = substr($dest, -1);

		$dest = substr($dest, 0, strlen($dest)-1);

	}

	return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>$ret";

}



/**

 * Callback to convert email address match to HTML A element.

 *

 * This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link

 * make_clickable()}.

 *

 * @since 2.3.2

 * @access private

 *

 * @param array $matches Single Regex Match.

 * @return string HTML A element with email address.

 */

function _make_email_clickable_cb($matches) {

	$email = $matches[2] . '@' . $matches[3];

	return $matches[1] . "<a href=\"mailto:$email\">$email</a>";

}



/**

 * Convert plaintext URI to HTML links.

 *

 * Converts URI, www and ftp, and email addresses. Finishes by fixing links

 * within links.

 *

 * @since 0.71

 *

 * @param string $text Content to convert URIs.

 * @return string Content with converted URIs.

 */

function make_clickable( $text ) {

	$r = '';

	$textarr = preg_split( '/(<[^<>]+>)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // split out HTML tags

	$nested_code_pre = 0; // Keep track of how many levels link is nested inside <pre> or <code>

	foreach ( $textarr as $piece ) {



		if ( preg_match( '|^<code[\s>]|i', $piece ) || preg_match( '|^<pre[\s>]|i', $piece ) )

			$nested_code_pre++;

		elseif ( ( '</code>' === strtolower( $piece ) || '</pre>' === strtolower( $piece ) ) && $nested_code_pre )

			$nested_code_pre--;



		if ( $nested_code_pre || empty( $piece ) || ( $piece[0] === '<' && ! preg_match( '|^<\s*[\w]{1,20}+://|', $piece ) ) ) {

			$r .= $piece;

			continue;

		}



		// Long strings might contain expensive edge cases ...

		if ( 10000 < strlen( $piece ) ) {

			// ... break it up

			foreach ( _split_str_by_whitespace( $piece, 2100 ) as $chunk ) { // 2100: Extra room for scheme and leading and trailing paretheses

				if ( 2101 < strlen( $chunk ) ) {

					$r .= $chunk; // Too big, no whitespace: bail.

				} else {

					$r .= make_clickable( $chunk );

				}

			}

		} else {

			$ret = " $piece "; // Pad with whitespace to simplify the regexes



			$url_clickable = '~

				([\\s(<.,;:!?])                                        # 1: Leading whitespace, or punctuation

				(                                                      # 2: URL

					[\\w]{1,20}+://                                # Scheme and hier-part prefix

					(?=\S{1,2000}\s)                               # Limit to URLs less than about 2000 characters long

					[\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]*+         # Non-punctuation URL character

					(?:                                            # Unroll the Loop: Only allow puctuation URL character if followed by a non-punctuation URL character

						[\'.,;:!?)]                            # Punctuation URL character

						[\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]++ # Non-punctuation URL character

					)*

				)

				(\)?)                                                  # 3: Trailing closing parenthesis (for parethesis balancing post processing)

			~xS'; // The regex is a non-anchored pattern and does not have a single fixed starting character.

			      // Tell PCRE to spend more time optimizing since, when used on a page load, it will probably be used several times.



			$ret = preg_replace_callback( $url_clickable, '_make_url_clickable_cb', $ret );



			$ret = preg_replace_callback( '#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', '_make_web_ftp_clickable_cb', $ret );

			$ret = preg_replace_callback( '#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret );



			$ret = substr( $ret, 1, -1 ); // Remove our whitespace padding.

			$r .= $ret;

		}

	}



	// Cleanup of accidental links within links

	$r = preg_replace( '#(<a([ \r\n\t]+[^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i', "$1$3</a>", $r );

	return $r;

}



/**

 * Breaks a string into chunks by splitting at whitespace characters.

 * The length of each returned chunk is as close to the specified length goal as possible,

 * with the caveat that each chunk includes its trailing delimiter.

 * Chunks longer than the goal are guaranteed to not have any inner whitespace.

 *

 * Joining the returned chunks with empty delimiters reconstructs the input string losslessly.

 *

 * Input string must have no null characters (or eventual transformations on output chunks must not care about null characters)

 *

 * <code>

 * _split_str_by_whitespace( "1234 67890 1234 67890a cd 1234   890 123456789 1234567890a    45678   1 3 5 7 90 ", 10 ) ==

 * array (

 *   0 => '1234 67890 ',  // 11 characters: Perfect split

 *   1 => '1234 ',        //  5 characters: '1234 67890a' was too long

 *   2 => '67890a cd ',   // 10 characters: '67890a cd 1234' was too long

 *   3 => '1234   890 ',  // 11 characters: Perfect split

 *   4 => '123456789 ',   // 10 characters: '123456789 1234567890a' was too long

 *   5 => '1234567890a ', // 12 characters: Too long, but no inner whitespace on which to split

 *   6 => '   45678   ',  // 11 characters: Perfect split

 *   7 => '1 3 5 7 9',    //  9 characters: End of $string

 * );

 * </code>

 *

 * @since 3.4.0

 * @access private

 *

 * @param string $string The string to split.

 * @param int $goal The desired chunk length.

 * @return array Numeric array of chunks.

 */

function _split_str_by_whitespace( $string, $goal ) {

	$chunks = array();



	$string_nullspace = strtr( $string, "\r\n\t\v\f ", "\000\000\000\000\000\000" );



	while ( $goal < strlen( $string_nullspace ) ) {

		$pos = strrpos( substr( $string_nullspace, 0, $goal + 1 ), "\000" );



		if ( false === $pos ) {

			$pos = strpos( $string_nullspace, "\000", $goal + 1 );

			if ( false === $pos ) {

				break;

			}

		}



		$chunks[] = substr( $string, 0, $pos + 1 );

		$string = substr( $string, $pos + 1 );

		$string_nullspace = substr( $string_nullspace, $pos + 1 );

	}



	if ( $string ) {

		$chunks[] = $string;

	}



	return $chunks;

}



/**

 * Adds rel nofollow string to all HTML A elements in content.

 *

 * @since 1.5.0

 *

 * @param string $text Content that may contain HTML A elements.

 * @return string Converted content.

 */

function wp_rel_nofollow( $text ) {

	// This is a pre save filter, so text is already escaped.

	$text = stripslashes($text);

	$text = preg_replace_callback('|<a (.+?)>|i', 'wp_rel_nofollow_callback', $text);

	$text = wp_slash($text);

	return $text;

}



/**

 * Callback to add rel=nofollow string to HTML A element.

 *

 * Will remove already existing rel="nofollow" and rel='nofollow' from the

 * string to prevent from invalidating (X)HTML.

 *

 * @since 2.3.0

 *

 * @param array $matches Single Match

 * @return string HTML A Element with rel nofollow.

 */

function wp_rel_nofollow_callback( $matches ) {

	$text = $matches[1];

	$text = str_replace(array(' rel="nofollow"', " rel='nofollow'"), '', $text);

	return "<a $text rel=\"nofollow\">";

}



/**

 * Convert one smiley code to the icon graphic file equivalent.

 *

 * Callback handler for {@link convert_smilies()}.

 * Looks up one smiley code in the $wpsmiliestrans global array and returns an

 * <img> string for that smiley.

 *

 * @global array $wpsmiliestrans

 * @since 2.8.0

 *

 * @param array $matches Single match. Smiley code to convert to image.

 * @return string Image string for smiley.

 */

function translate_smiley( $matches ) {

	global $wpsmiliestrans;



	if ( count( $matches ) == 0 )

		return '';



	$smiley = trim( reset( $matches ) );

	$img = $wpsmiliestrans[ $smiley ];



	/**

	 * Filter the Smiley image URL before it's used in the image element.

	 *

	 * @since 2.9.0

	 *

	 * @param string $smiley_url URL for the smiley image.

	 * @param string $img        Filename for the smiley image.

	 * @param string $site_url   Site URL, as returned by site_url().

	 */

	$src_url = apply_filters( 'smilies_src', includes_url( "images/smilies/$img" ), $img, site_url() );



	return sprintf( '<img src="%s" alt="%s" class="wp-smiley" />', esc_url( $src_url ), esc_attr( $smiley ) );

}



/**

 * Convert text equivalent of smilies to images.

 *

 * Will only convert smilies if the option 'use_smilies' is true and the global

 * used in the function isn't empty.

 *

 * @since 0.71

 * @uses $wp_smiliessearch

 *

 * @param string $text Content to convert smilies from text.

 * @return string Converted content with text smilies replaced with images.

 */

function convert_smilies( $text ) {

	global $wp_smiliessearch;

	$output = '';

	if ( get_option( 'use_smilies' ) && ! empty( $wp_smiliessearch ) ) {

		// HTML loop taken from texturize function, could possible be consolidated

		$textarr = preg_split( '/(<.*>)/U', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // capture the tags as well as in between

		$stop = count( $textarr );// loop stuff



		// Ignore proessing of specific tags

		$tags_to_ignore = 'code|pre|style|script|textarea';

		$ignore_block_element = '';



		for ( $i = 0; $i < $stop; $i++ ) {

			$content = $textarr[$i];



			// If we're in an ignore block, wait until we find its closing tag

			if ( '' == $ignore_block_element && preg_match( '/^<(' . $tags_to_ignore . ')>/', $content, $matches ) )  {

				$ignore_block_element = $matches[1];

			}



			// If it's not a tag and not in ignore block

			if ( '' ==  $ignore_block_element && strlen( $content ) > 0 && '<' != $content[0] ) {

				$content = preg_replace_callback( $wp_smiliessearch, 'translate_smiley', $content );

			}



			// did we exit ignore block

			if ( '' != $ignore_block_element && '</' . $ignore_block_element . '>' == $content )  {

				$ignore_block_element = '';

			}



			$output .= $content;

		}

	} else {

		// return default text.

		$output = $text;

	}

	return $output;

}



/**

 * Verifies that an email is valid.

 *

 * Does not grok i18n domains. Not RFC compliant.

 *

 * @since 0.71

 *

 * @param string $email Email address to verify.

 * @param boolean $deprecated Deprecated.

 * @return string|bool Either false or the valid email address.

 */

function is_email( $email, $deprecated = false ) {

	if ( ! empty( $deprecated ) )

		_deprecated_argument( __FUNCTION__, '3.0' );



	// Test for the minimum length the email can be

	if ( strlen( $email ) < 3 ) {

		/**

		 * Filter whether an email address is valid.

		 *

		 * This filter is evaluated under several different contexts, such as 'email_too_short',

		 * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',

		 * 'domain_no_periods', 'sub_hyphen_limits', 'sub_invalid_chars', or no specific context.

		 *

		 * @since 2.8.0

		 *

		 * @param bool   $is_email Whether the email address has passed the is_email() checks. Default false.

		 * @param string $email    The email address being checked.

		 * @param string $message  An explanatory message to the user.

		 * @param string $context  Context under which the email was tested.

		 */

		return apply_filters( 'is_email', false, $email, 'email_too_short' );

	}



	// Test for an @ character after the first position

	if ( strpos( $email, '@', 1 ) === false ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'is_email', false, $email, 'email_no_at' );

	}



	// Split out the local and domain parts

	list( $local, $domain ) = explode( '@', $email, 2 );



	// LOCAL PART

	// Test for invalid characters

	if ( !preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'is_email', false, $email, 'local_invalid_chars' );

	}



	// DOMAIN PART

	// Test for sequences of periods

	if ( preg_match( '/\.{2,}/', $domain ) ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'is_email', false, $email, 'domain_period_sequence' );

	}



	// Test for leading and trailing periods and whitespace

	if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'is_email', false, $email, 'domain_period_limits' );

	}



	// Split the domain into subs

	$subs = explode( '.', $domain );



	// Assume the domain will have at least two subs

	if ( 2 > count( $subs ) ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'is_email', false, $email, 'domain_no_periods' );

	}



	// Loop through each sub

	foreach ( $subs as $sub ) {

		// Test for leading and trailing hyphens and whitespace

		if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) {

			/** This filter is documented in wp-includes/formatting.php */

			return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' );

		}



		// Test for invalid characters

		if ( !preg_match('/^[a-z0-9-]+$/i', $sub ) ) {

			/** This filter is documented in wp-includes/formatting.php */

			return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );

		}

	}



	// Congratulations your email made it!

	/** This filter is documented in wp-includes/formatting.php */

	return apply_filters( 'is_email', $email, $email, null );

}



/**

 * Convert to ASCII from email subjects.

 *

 * @since 1.2.0

 *

 * @param string $string Subject line

 * @return string Converted string to ASCII

 */

function wp_iso_descrambler($string) {

	/* this may only work with iso-8859-1, I'm afraid */

	if (!preg_match('#\=\?(.+)\?Q\?(.+)\?\=#i', $string, $matches)) {

		return $string;

	} else {

		$subject = str_replace('_', ' ', $matches[2]);

		$subject = preg_replace_callback('#\=([0-9a-f]{2})#i', '_wp_iso_convert', $subject);

		return $subject;

	}

}



/**

 * Helper function to convert hex encoded chars to ASCII

 *

 * @since 3.1.0

 * @access private

 *

 * @param array $match The preg_replace_callback matches array

 * @return array Converted chars

 */

function _wp_iso_convert( $match ) {

	return chr( hexdec( strtolower( $match[1] ) ) );

}



/**

 * Returns a date in the GMT equivalent.

 *

 * Requires and returns a date in the Y-m-d H:i:s format. If there is a

 * timezone_string available, the date is assumed to be in that timezone,

 * otherwise it simply subtracts the value of the 'gmt_offset' option. Return

 * format can be overridden using the $format parameter.

 *

 * @since 1.2.0

 *

 * @uses get_option() to retrieve the value of 'gmt_offset'.

 * @param string $string The date to be converted.

 * @param string $format The format string for the returned date (default is Y-m-d H:i:s)

 * @return string GMT version of the date provided.

 */

function get_gmt_from_date( $string, $format = 'Y-m-d H:i:s' ) {

	$tz = get_option( 'timezone_string' );

	if ( $tz ) {

		$datetime = date_create( $string, new DateTimeZone( $tz ) );

		if ( ! $datetime )

			return gmdate( $format, 0 );

		$datetime->setTimezone( new DateTimeZone( 'UTC' ) );

		$string_gmt = $datetime->format( $format );

	} else {

		if ( ! preg_match( '#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches ) )

			return gmdate( $format, 0 );

		$string_time = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] );

		$string_gmt = gmdate( $format, $string_time - get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );

	}

	return $string_gmt;

}



/**

 * Converts a GMT date into the correct format for the blog.

 *

 * Requires and returns a date in the Y-m-d H:i:s format. If there is a

 * timezone_string available, the returned date is in that timezone, otherwise

 * it simply adds the value of gmt_offset. Return format can be overridden

 * using the $format parameter

 *

 * @since 1.2.0

 *

 * @param string $string The date to be converted.

 * @param string $format The format string for the returned date (default is Y-m-d H:i:s)

 * @return string Formatted date relative to the timezone / GMT offset.

 */

function get_date_from_gmt( $string, $format = 'Y-m-d H:i:s' ) {

	$tz = get_option( 'timezone_string' );

	if ( $tz ) {

		$datetime = date_create( $string, new DateTimeZone( 'UTC' ) );

		if ( ! $datetime )

			return date( $format, 0 );

		$datetime->setTimezone( new DateTimeZone( $tz ) );

		$string_localtime = $datetime->format( $format );

	} else {

		if ( ! preg_match('#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches) )

			return date( $format, 0 );

		$string_time = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] );

		$string_localtime = gmdate( $format, $string_time + get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );

	}

	return $string_localtime;

}



/**

 * Computes an offset in seconds from an iso8601 timezone.

 *

 * @since 1.5.0

 *

 * @param string $timezone Either 'Z' for 0 offset or 'Âąhhmm'.

 * @return int|float The offset in seconds.

 */

function iso8601_timezone_to_offset($timezone) {

	// $timezone is either 'Z' or '[+|-]hhmm'

	if ($timezone == 'Z') {

		$offset = 0;

	} else {

		$sign    = (substr($timezone, 0, 1) == '+') ? 1 : -1;

		$hours   = intval(substr($timezone, 1, 2));

		$minutes = intval(substr($timezone, 3, 4)) / 60;

		$offset  = $sign * HOUR_IN_SECONDS * ($hours + $minutes);

	}

	return $offset;

}



/**

 * Converts an iso8601 date to MySQL DateTime format used by post_date[_gmt].

 *

 * @since 1.5.0

 *

 * @param string $date_string Date and time in ISO 8601 format {@link http://en.wikipedia.org/wiki/ISO_8601}.

 * @param string $timezone Optional. If set to GMT returns the time minus gmt_offset. Default is 'user'.

 * @return string The date and time in MySQL DateTime format - Y-m-d H:i:s.

 */

function iso8601_to_datetime($date_string, $timezone = 'user') {

	$timezone = strtolower($timezone);



	if ($timezone == 'gmt') {



		preg_match('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[\+|\-][0-9]{2,4}){0,1}#', $date_string, $date_bits);



		if (!empty($date_bits[7])) { // we have a timezone, so let's compute an offset

			$offset = iso8601_timezone_to_offset($date_bits[7]);

		} else { // we don't have a timezone, so we assume user local timezone (not server's!)

			$offset = HOUR_IN_SECONDS * get_option('gmt_offset');

		}



		$timestamp = gmmktime($date_bits[4], $date_bits[5], $date_bits[6], $date_bits[2], $date_bits[3], $date_bits[1]);

		$timestamp -= $offset;



		return gmdate('Y-m-d H:i:s', $timestamp);



	} else if ($timezone == 'user') {

		return preg_replace('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z|[\+|\-][0-9]{2,4}){0,1}#', '$1-$2-$3 $4:$5:$6', $date_string);

	}

}



/**

 * Adds a element attributes to open links in new windows.

 *

 * Comment text in popup windows should be filtered through this. Right now it's

 * a moderately dumb function, ideally it would detect whether a target or rel

 * attribute was already there and adjust its actions accordingly.

 *

 * @since 0.71

 *

 * @param string $text Content to replace links to open in a new window.

 * @return string Content that has filtered links.

 */

function popuplinks($text) {

	$text = preg_replace('/<a (.+?)>/i', "<a $1 target='_blank' rel='external'>", $text);

	return $text;

}



/**

 * Strips out all characters that are not allowable in an email.

 *

 * @since 1.5.0

 *

 * @param string $email Email address to filter.

 * @return string Filtered email address.

 */

function sanitize_email( $email ) {

	// Test for the minimum length the email can be

	if ( strlen( $email ) < 3 ) {

		/**

		 * Filter a sanitized email address.

		 *

		 * This filter is evaluated under several contexts, including 'email_too_short',

		 * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',

		 * 'domain_no_periods', 'domain_no_valid_subs', or no context.

		 *

		 * @since 2.8.0

		 *

		 * @param string $email   The sanitized email address.

		 * @param string $email   The email address, as provided to sanitize_email().

		 * @param string $message A message to pass to the user.

		 */

		return apply_filters( 'sanitize_email', '', $email, 'email_too_short' );

	}



	// Test for an @ character after the first position

	if ( strpos( $email, '@', 1 ) === false ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'sanitize_email', '', $email, 'email_no_at' );

	}



	// Split out the local and domain parts

	list( $local, $domain ) = explode( '@', $email, 2 );



	// LOCAL PART

	// Test for invalid characters

	$local = preg_replace( '/[^a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]/', '', $local );

	if ( '' === $local ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'sanitize_email', '', $email, 'local_invalid_chars' );

	}



	// DOMAIN PART

	// Test for sequences of periods

	$domain = preg_replace( '/\.{2,}/', '', $domain );

	if ( '' === $domain ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'sanitize_email', '', $email, 'domain_period_sequence' );

	}



	// Test for leading and trailing periods and whitespace

	$domain = trim( $domain, " \t\n\r\0\x0B." );

	if ( '' === $domain ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'sanitize_email', '', $email, 'domain_period_limits' );

	}



	// Split the domain into subs

	$subs = explode( '.', $domain );



	// Assume the domain will have at least two subs

	if ( 2 > count( $subs ) ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'sanitize_email', '', $email, 'domain_no_periods' );

	}



	// Create an array that will contain valid subs

	$new_subs = array();



	// Loop through each sub

	foreach ( $subs as $sub ) {

		// Test for leading and trailing hyphens

		$sub = trim( $sub, " \t\n\r\0\x0B-" );



		// Test for invalid characters

		$sub = preg_replace( '/[^a-z0-9-]+/i', '', $sub );



		// If there's anything left, add it to the valid subs

		if ( '' !== $sub ) {

			$new_subs[] = $sub;

		}

	}



	// If there aren't 2 or more valid subs

	if ( 2 > count( $new_subs ) ) {

		/** This filter is documented in wp-includes/formatting.php */

		return apply_filters( 'sanitize_email', '', $email, 'domain_no_valid_subs' );

	}



	// Join valid subs into the new domain

	$domain = join( '.', $new_subs );



	// Put the email back together

	$email = $local . '@' . $domain;



	// Congratulations your email made it!

	/** This filter is documented in wp-includes/formatting.php */

	return apply_filters( 'sanitize_email', $email, $email, null );

}



/**

 * Determines the difference between two timestamps.

 *

 * The difference is returned in a human readable format such as "1 hour",

 * "5 mins", "2 days".

 *

 * @since 1.5.0

 *

 * @param int $from Unix timestamp from which the difference begins.

 * @param int $to Optional. Unix timestamp to end the time difference. Default becomes time() if not set.

 * @return string Human readable time difference.

 */

function human_time_diff( $from, $to = '' ) {

	if ( empty( $to ) ) {

		$to = time();

	}



	$diff = (int) abs( $to - $from );



	if ( $diff < HOUR_IN_SECONDS ) {

		$mins = round( $diff / MINUTE_IN_SECONDS );

		if ( $mins <= 1 )

			$mins = 1;

		/* translators: min=minute */

		$since = sprintf( _n( '%s min', '%s mins', $mins ), $mins );

	} elseif ( $diff < DAY_IN_SECONDS && $diff >= HOUR_IN_SECONDS ) {

		$hours = round( $diff / HOUR_IN_SECONDS );

		if ( $hours <= 1 )

			$hours = 1;

		$since = sprintf( _n( '%s hour', '%s hours', $hours ), $hours );

	} elseif ( $diff < WEEK_IN_SECONDS && $diff >= DAY_IN_SECONDS ) {

		$days = round( $diff / DAY_IN_SECONDS );

		if ( $days <= 1 )

			$days = 1;

		$since = sprintf( _n( '%s day', '%s days', $days ), $days );

	} elseif ( $diff < 30 * DAY_IN_SECONDS && $diff >= WEEK_IN_SECONDS ) {

		$weeks = round( $diff / WEEK_IN_SECONDS );

		if ( $weeks <= 1 )

			$weeks = 1;

		$since = sprintf( _n( '%s week', '%s weeks', $weeks ), $weeks );

	} elseif ( $diff < YEAR_IN_SECONDS && $diff >= 30 * DAY_IN_SECONDS ) {

		$months = round( $diff / ( 30 * DAY_IN_SECONDS ) );

		if ( $months <= 1 )

			$months = 1;

		$since = sprintf( _n( '%s month', '%s months', $months ), $months );

	} elseif ( $diff >= YEAR_IN_SECONDS ) {

		$years = round( $diff / YEAR_IN_SECONDS );

		if ( $years <= 1 )

			$years = 1;

		$since = sprintf( _n( '%s year', '%s years', $years ), $years );

	}



	/**

	 * Filter the human readable difference between two timestamps.

	 *

	 * @since 4.0.0

	 *

	 * @param string $since The difference in human readable text.

	 * @param int    $diff  The difference in seconds.

	 * @param int    $from  Unix timestamp from which the difference begins.

	 * @param int    $to    Unix timestamp to end the time difference.

	 */

	return apply_filters( 'human_time_diff', $since, $diff, $from, $to );

}



/**

 * Generates an excerpt from the content, if needed.

 *

 * The excerpt word amount will be 55 words and if the amount is greater than

 * that, then the string ' [&hellip;]' will be appended to the excerpt. If the string

 * is less than 55 words, then the content will be returned as is.

 *

 * The 55 word limit can be modified by plugins/themes using the excerpt_length filter

 * The ' [&hellip;]' string can be modified by plugins/themes using the excerpt_more filter

 *

 * @since 1.5.0

 *

 * @param string $text Optional. The excerpt. If set to empty, an excerpt is generated.

 * @return string The excerpt.

 */

function wp_trim_excerpt($text = '') {

	$raw_excerpt = $text;

	if ( '' == $text ) {

		$text = get_the_content('');



		$text = strip_shortcodes( $text );



		/** This filter is documented in wp-includes/post-template.php */

		$text = apply_filters( 'the_content', $text );

		$text = str_replace(']]>', ']]&gt;', $text);



		/**

		 * Filter the number of words in an excerpt.

		 *

		 * @since 2.7.0

		 *

		 * @param int $number The number of words. Default 55.

		 */

		$excerpt_length = apply_filters( 'excerpt_length', 55 );

		/**

		 * Filter the string in the "more" link displayed after a trimmed excerpt.

		 *

		 * @since 2.9.0

		 *

		 * @param string $more_string The string shown within the more link.

		 */

		$excerpt_more = apply_filters( 'excerpt_more', ' ' . '[&hellip;]' );

		$text = wp_trim_words( $text, $excerpt_length, $excerpt_more );

	}

	/**

	 * Filter the trimmed excerpt string.

	 *

	 * @since 2.8.0

	 *

	 * @param string $text        The trimmed text.

	 * @param string $raw_excerpt The text prior to trimming.

	 */

	return apply_filters( 'wp_trim_excerpt', $text, $raw_excerpt );

}



/**

 * Trims text to a certain number of words.

 *

 * This function is localized. For languages that count 'words' by the individual

 * character (such as East Asian languages), the $num_words argument will apply

 * to the number of individual characters.

 *

 * @since 3.3.0

 *

 * @param string $text Text to trim.

 * @param int $num_words Number of words. Default 55.

 * @param string $more Optional. What to append if $text needs to be trimmed. Default '&hellip;'.

 * @return string Trimmed text.

 */

function wp_trim_words( $text, $num_words = 55, $more = null ) {

	if ( null === $more )

		$more = __( '&hellip;' );

	$original_text = $text;

	$text = wp_strip_all_tags( $text );

	/* translators: If your word count is based on single characters (East Asian characters),

	   enter 'characters'. Otherwise, enter 'words'. Do not translate into your own language. */

	if ( 'characters' == _x( 'words', 'word count: words or characters?' ) && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {

		$text = trim( preg_replace( "/[\n\r\t ]+/", ' ', $text ), ' ' );

		preg_match_all( '/./u', $text, $words_array );

		$words_array = array_slice( $words_array[0], 0, $num_words + 1 );

		$sep = '';

	} else {

		$words_array = preg_split( "/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY );

		$sep = ' ';

	}

	if ( count( $words_array ) > $num_words ) {

		array_pop( $words_array );

		$text = implode( $sep, $words_array );

		$text = $text . $more;

	} else {

		$text = implode( $sep, $words_array );

	}

	/**

	 * Filter the text content after words have been trimmed.

	 *

	 * @since 3.3.0

	 *

	 * @param string $text          The trimmed text.

	 * @param int    $num_words     The number of words to trim the text to. Default 5.

	 * @param string $more          An optional string to append to the end of the trimmed text, e.g. &hellip;.

	 * @param string $original_text The text before it was trimmed.

	 */

	return apply_filters( 'wp_trim_words', $text, $num_words, $more, $original_text );

}



/**

 * Converts named entities into numbered entities.

 *

 * @since 1.5.1

 *

 * @param string $text The text within which entities will be converted.

 * @return string Text with converted entities.

 */

function ent2ncr($text) {



	/**

	 * Filter text before named entities are converted into numbered entities.

	 *

	 * A non-null string must be returned for the filter to be evaluated.

	 *

	 * @since 3.3.0

	 *

	 * @param null   $converted_text The text to be converted. Default null.

	 * @param string $text           The text prior to entity conversion.

	 */

	$filtered = apply_filters( 'pre_ent2ncr', null, $text );

	if( null !== $filtered )

		return $filtered;



	$to_ncr = array(

		'&quot;' => '&#34;',

		'&amp;' => '&#38;',

		'&lt;' => '&#60;',

		'&gt;' => '&#62;',

		'|' => '&#124;',

		'&nbsp;' => '&#160;',

		'&iexcl;' => '&#161;',

		'&cent;' => '&#162;',

		'&pound;' => '&#163;',

		'&curren;' => '&#164;',

		'&yen;' => '&#165;',

		'&brvbar;' => '&#166;',

		'&brkbar;' => '&#166;',

		'&sect;' => '&#167;',

		'&uml;' => '&#168;',

		'&die;' => '&#168;',

		'&copy;' => '&#169;',

		'&ordf;' => '&#170;',

		'&laquo;' => '&#171;',

		'&not;' => '&#172;',

		'&shy;' => '&#173;',

		'&reg;' => '&#174;',

		'&macr;' => '&#175;',

		'&hibar;' => '&#175;',

		'&deg;' => '&#176;',

		'&plusmn;' => '&#177;',

		'&sup2;' => '&#178;',

		'&sup3;' => '&#179;',

		'&acute;' => '&#180;',

		'&micro;' => '&#181;',

		'&para;' => '&#182;',

		'&middot;' => '&#183;',

		'&cedil;' => '&#184;',

		'&sup1;' => '&#185;',

		'&ordm;' => '&#186;',

		'&raquo;' => '&#187;',

		'&frac14;' => '&#188;',

		'&frac12;' => '&#189;',

		'&frac34;' => '&#190;',

		'&iquest;' => '&#191;',

		'&Agrave;' => '&#192;',

		'&Aacute;' => '&#193;',

		'&Acirc;' => '&#194;',

		'&Atilde;' => '&#195;',

		'&Auml;' => '&#196;',

		'&Aring;' => '&#197;',

		'&AElig;' => '&#198;',

		'&Ccedil;' => '&#199;',

		'&Egrave;' => '&#200;',

		'&Eacute;' => '&#201;',

		'&Ecirc;' => '&#202;',

		'&Euml;' => '&#203;',

		'&Igrave;' => '&#204;',

		'&Iacute;' => '&#205;',

		'&Icirc;' => '&#206;',

		'&Iuml;' => '&#207;',

		'&ETH;' => '&#208;',

		'&Ntilde;' => '&#209;',

		'&Ograve;' => '&#210;',

		'&Oacute;' => '&#211;',

		'&Ocirc;' => '&#212;',

		'&Otilde;' => '&#213;',

		'&Ouml;' => '&#214;',

		'&times;' => '&#215;',

		'&Oslash;' => '&#216;',

		'&Ugrave;' => '&#217;',

		'&Uacute;' => '&#218;',

		'&Ucirc;' => '&#219;',

		'&Uuml;' => '&#220;',

		'&Yacute;' => '&#221;',

		'&THORN;' => '&#222;',

		'&szlig;' => '&#223;',

		'&agrave;' => '&#224;',

		'&aacute;' => '&#225;',

		'&acirc;' => '&#226;',

		'&atilde;' => '&#227;',

		'&auml;' => '&#228;',

		'&aring;' => '&#229;',

		'&aelig;' => '&#230;',

		'&ccedil;' => '&#231;',

		'&egrave;' => '&#232;',

		'&eacute;' => '&#233;',

		'&ecirc;' => '&#234;',

		'&euml;' => '&#235;',

		'&igrave;' => '&#236;',

		'&iacute;' => '&#237;',

		'&icirc;' => '&#238;',

		'&iuml;' => '&#239;',

		'&eth;' => '&#240;',

		'&ntilde;' => '&#241;',

		'&ograve;' => '&#242;',

		'&oacute;' => '&#243;',

		'&ocirc;' => '&#244;',

		'&otilde;' => '&#245;',

		'&ouml;' => '&#246;',

		'&divide;' => '&#247;',

		'&oslash;' => '&#248;',

		'&ugrave;' => '&#249;',

		'&uacute;' => '&#250;',

		'&ucirc;' => '&#251;',

		'&uuml;' => '&#252;',

		'&yacute;' => '&#253;',

		'&thorn;' => '&#254;',

		'&yuml;' => '&#255;',

		'&OElig;' => '&#338;',

		'&oelig;' => '&#339;',

		'&Scaron;' => '&#352;',

		'&scaron;' => '&#353;',

		'&Yuml;' => '&#376;',

		'&fnof;' => '&#402;',

		'&circ;' => '&#710;',

		'&tilde;' => '&#732;',

		'&Alpha;' => '&#913;',

		'&Beta;' => '&#914;',

		'&Gamma;' => '&#915;',

		'&Delta;' => '&#916;',

		'&Epsilon;' => '&#917;',

		'&Zeta;' => '&#918;',

		'&Eta;' => '&#919;',

		'&Theta;' => '&#920;',

		'&Iota;' => '&#921;',

		'&Kappa;' => '&#922;',

		'&Lambda;' => '&#923;',

		'&Mu;' => '&#924;',

		'&Nu;' => '&#925;',

		'&Xi;' => '&#926;',

		'&Omicron;' => '&#927;',

		'&Pi;' => '&#928;',

		'&Rho;' => '&#929;',

		'&Sigma;' => '&#931;',

		'&Tau;' => '&#932;',

		'&Upsilon;' => '&#933;',

		'&Phi;' => '&#934;',

		'&Chi;' => '&#935;',

		'&Psi;' => '&#936;',

		'&Omega;' => '&#937;',

		'&alpha;' => '&#945;',

		'&beta;' => '&#946;',

		'&gamma;' => '&#947;',

		'&delta;' => '&#948;',

		'&epsilon;' => '&#949;',

		'&zeta;' => '&#950;',

		'&eta;' => '&#951;',

		'&theta;' => '&#952;',

		'&iota;' => '&#953;',

		'&kappa;' => '&#954;',

		'&lambda;' => '&#955;',

		'&mu;' => '&#956;',

		'&nu;' => '&#957;',

		'&xi;' => '&#958;',

		'&omicron;' => '&#959;',

		'&pi;' => '&#960;',

		'&rho;' => '&#961;',

		'&sigmaf;' => '&#962;',

		'&sigma;' => '&#963;',

		'&tau;' => '&#964;',

		'&upsilon;' => '&#965;',

		'&phi;' => '&#966;',

		'&chi;' => '&#967;',

		'&psi;' => '&#968;',

		'&omega;' => '&#969;',

		'&thetasym;' => '&#977;',

		'&upsih;' => '&#978;',

		'&piv;' => '&#982;',

		'&ensp;' => '&#8194;',

		'&emsp;' => '&#8195;',

		'&thinsp;' => '&#8201;',

		'&zwnj;' => '&#8204;',

		'&zwj;' => '&#8205;',

		'&lrm;' => '&#8206;',

		'&rlm;' => '&#8207;',

		'&ndash;' => '&#8211;',

		'&mdash;' => '&#8212;',

		'&lsquo;' => '&#8216;',

		'&rsquo;' => '&#8217;',

		'&sbquo;' => '&#8218;',

		'&ldquo;' => '&#8220;',

		'&rdquo;' => '&#8221;',

		'&bdquo;' => '&#8222;',

		'&dagger;' => '&#8224;',

		'&Dagger;' => '&#8225;',

		'&bull;' => '&#8226;',

		'&hellip;' => '&#8230;',

		'&permil;' => '&#8240;',

		'&prime;' => '&#8242;',

		'&Prime;' => '&#8243;',

		'&lsaquo;' => '&#8249;',

		'&rsaquo;' => '&#8250;',

		'&oline;' => '&#8254;',

		'&frasl;' => '&#8260;',

		'&euro;' => '&#8364;',

		'&image;' => '&#8465;',

		'&weierp;' => '&#8472;',

		'&real;' => '&#8476;',

		'&trade;' => '&#8482;',

		'&alefsym;' => '&#8501;',

		'&crarr;' => '&#8629;',

		'&lArr;' => '&#8656;',

		'&uArr;' => '&#8657;',

		'&rArr;' => '&#8658;',

		'&dArr;' => '&#8659;',

		'&hArr;' => '&#8660;',

		'&forall;' => '&#8704;',

		'&part;' => '&#8706;',

		'&exist;' => '&#8707;',

		'&empty;' => '&#8709;',

		'&nabla;' => '&#8711;',

		'&isin;' => '&#8712;',

		'&notin;' => '&#8713;',

		'&ni;' => '&#8715;',

		'&prod;' => '&#8719;',

		'&sum;' => '&#8721;',

		'&minus;' => '&#8722;',

		'&lowast;' => '&#8727;',

		'&radic;' => '&#8730;',

		'&prop;' => '&#8733;',

		'&infin;' => '&#8734;',

		'&ang;' => '&#8736;',

		'&and;' => '&#8743;',

		'&or;' => '&#8744;',

		'&cap;' => '&#8745;',

		'&cup;' => '&#8746;',

		'&int;' => '&#8747;',

		'&there4;' => '&#8756;',

		'&sim;' => '&#8764;',

		'&cong;' => '&#8773;',

		'&asymp;' => '&#8776;',

		'&ne;' => '&#8800;',

		'&equiv;' => '&#8801;',

		'&le;' => '&#8804;',

		'&ge;' => '&#8805;',

		'&sub;' => '&#8834;',

		'&sup;' => '&#8835;',

		'&nsub;' => '&#8836;',

		'&sube;' => '&#8838;',

		'&supe;' => '&#8839;',

		'&oplus;' => '&#8853;',

		'&otimes;' => '&#8855;',

		'&perp;' => '&#8869;',

		'&sdot;' => '&#8901;',

		'&lceil;' => '&#8968;',

		'&rceil;' => '&#8969;',

		'&lfloor;' => '&#8970;',

		'&rfloor;' => '&#8971;',

		'&lang;' => '&#9001;',

		'&rang;' => '&#9002;',

		'&larr;' => '&#8592;',

		'&uarr;' => '&#8593;',

		'&rarr;' => '&#8594;',

		'&darr;' => '&#8595;',

		'&harr;' => '&#8596;',

		'&loz;' => '&#9674;',

		'&spades;' => '&#9824;',

		'&clubs;' => '&#9827;',

		'&hearts;' => '&#9829;',

		'&diams;' => '&#9830;'

	);



	return str_replace( array_keys($to_ncr), array_values($to_ncr), $text );

}



/**

 * Formats text for the rich text editor.

 *

 * The filter 'richedit_pre' is applied here. If $text is empty the filter will

 * be applied to an empty string.

 *

 * @since 2.0.0

 *

 * @param string $text The text to be formatted.

 * @return string The formatted text after filter is applied.

 */

function wp_richedit_pre($text) {

	if ( empty( $text ) ) {

		/**

		 * Filter text returned for the rich text editor.

		 *

		 * This filter is first evaluated, and the value returned, if an empty string

		 * is passed to wp_richedit_pre(). If an empty string is passed, it results

		 * in a break tag and line feed.

		 *

		 * If a non-empty string is passed, the filter is evaluated on the wp_richedit_pre()

		 * return after being formatted.

		 *

		 * @since 2.0.0

		 *

		 * @param string $output Text for the rich text editor.

		 */

		return apply_filters( 'richedit_pre', '' );

	}



	$output = convert_chars($text);

	$output = wpautop($output);

	$output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) );



	/** This filter is documented in wp-includes/formatting.php */

	return apply_filters( 'richedit_pre', $output );

}



/**

 * Formats text for the HTML editor.

 *

 * Unless $output is empty it will pass through htmlspecialchars before the

 * 'htmledit_pre' filter is applied.

 *

 * @since 2.5.0

 *

 * @param string $output The text to be formatted.

 * @return string Formatted text after filter applied.

 */

function wp_htmledit_pre($output) {

	if ( !empty($output) )

		$output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) ); // convert only < > &



	/**

	 * Filter the text before it is formatted for the HTML editor.

	 *

	 * @since 2.5.0

	 *

	 * @param string $output The HTML-formatted text.

	 */

	return apply_filters( 'htmledit_pre', $output );

}



/**

 * Perform a deep string replace operation to ensure the values in $search are no longer present

 *

 * Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values

 * e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that

 * str_replace would return

 *

 * @since 2.8.1

 * @access private

 *

 * @param string|array $search The value being searched for, otherwise known as the needle. An array may be used to designate multiple needles.

 * @param string $subject The string being searched and replaced on, otherwise known as the haystack.

 * @return string The string with the replaced svalues.

 */

function _deep_replace( $search, $subject ) {

	$subject = (string) $subject;



	$count = 1;

	while ( $count ) {

		$subject = str_replace( $search, '', $subject, $count );

	}



	return $subject;

}



/**

 * Escapes data for use in a MySQL query.

 *

 * Usually you should prepare queries using wpdb::prepare().

 * Sometimes, spot-escaping is required or useful. One example

 * is preparing an array for use in an IN clause.

 *

 * @since 2.8.0

 * @param string|array $data Unescaped data

 * @return string|array Escaped data

 */

function esc_sql( $data ) {

	global $wpdb;

	return $wpdb->_escape( $data );

}



/**

 * Checks and cleans a URL.

 *

 * A number of characters are removed from the URL. If the URL is for displaying

 * (the default behaviour) ampersands are also replaced. The 'clean_url' filter

 * is applied to the returned cleaned URL.

 *

 * @since 2.8.0

 * @uses wp_kses_bad_protocol() To only permit protocols in the URL set

 *		via $protocols or the common ones set in the function.

 *

 * @param string $url The URL to be cleaned.

 * @param array $protocols Optional. An array of acceptable protocols.

 *		Defaults to 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn' if not set.

 * @param string $_context Private. Use esc_url_raw() for database usage.

 * @return string The cleaned $url after the 'clean_url' filter is applied.

 */

function esc_url( $url, $protocols = null, $_context = 'display' ) {

	$original_url = $url;



	if ( '' == $url )

		return $url;

	$url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url);

	$strip = array('%0d', '%0a', '%0D', '%0A');

	$url = _deep_replace($strip, $url);

	$url = str_replace(';//', '://', $url);

	/* If the URL doesn't appear to contain a scheme, we

	 * presume it needs http:// appended (unless a relative

	 * link starting with /, # or ? or a php file).

	 */

	if ( strpos($url, ':') === false && ! in_array( $url[0], array( '/', '#', '?' ) ) &&

		! preg_match('/^[a-z0-9-]+?\.php/i', $url) )

		$url = 'http://' . $url;



	// Replace ampersands and single quotes only when displaying.

	if ( 'display' == $_context ) {

		$url = wp_kses_normalize_entities( $url );

		$url = str_replace( '&amp;', '&#038;', $url );

		$url = str_replace( "'", '&#039;', $url );

	}



	if ( '/' === $url[0] ) {

		$good_protocol_url = $url;

	} else {

		if ( ! is_array( $protocols ) )

			$protocols = wp_allowed_protocols();

		$good_protocol_url = wp_kses_bad_protocol( $url, $protocols );

		if ( strtolower( $good_protocol_url ) != strtolower( $url ) )

			return '';

	}



	/**

	 * Filter a string cleaned and escaped for output as a URL.

	 *

	 * @since 2.3.0

	 *

	 * @param string $good_protocol_url The cleaned URL to be returned.

	 * @param string $original_url      The URL prior to cleaning.

	 * @param string $_context          If 'display', replace ampersands and single quotes only.

	 */

	return apply_filters( 'clean_url', $good_protocol_url, $original_url, $_context );

}



/**

 * Performs esc_url() for database usage.

 *

 * @since 2.8.0

 * @uses esc_url()

 *

 * @param string $url The URL to be cleaned.

 * @param array $protocols An array of acceptable protocols.

 * @return string The cleaned URL.

 */

function esc_url_raw( $url, $protocols = null ) {

	return esc_url( $url, $protocols, 'db' );

}



/**

 * Convert entities, while preserving already-encoded entities.

 *

 * @link http://www.php.net/htmlentities Borrowed from the PHP Manual user notes.

 *

 * @since 1.2.2

 *

 * @param string $myHTML The text to be converted.

 * @return string Converted text.

 */

function htmlentities2($myHTML) {

	$translation_table = get_html_translation_table( HTML_ENTITIES, ENT_QUOTES );

	$translation_table[chr(38)] = '&';

	return preg_replace( "/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,3};)/", "&amp;", strtr($myHTML, $translation_table) );

}



/**

 * Escape single quotes, htmlspecialchar " < > &, and fix line endings.

 *

 * Escapes text strings for echoing in JS. It is intended to be used for inline JS

 * (in a tag attribute, for example onclick="..."). Note that the strings have to

 * be in single quotes. The filter 'js_escape' is also applied here.

 *

 * @since 2.8.0

 *

 * @param string $text The text to be escaped.

 * @return string Escaped text.

 */

function esc_js( $text ) {

	$safe_text = wp_check_invalid_utf8( $text );

	$safe_text = _wp_specialchars( $safe_text, ENT_COMPAT );

	$safe_text = preg_replace( '/&#(x)?0*(?(1)27|39);?/i', "'", stripslashes( $safe_text ) );

	$safe_text = str_replace( "\r", '', $safe_text );

	$safe_text = str_replace( "\n", '\\n', addslashes( $safe_text ) );

	/**

	 * Filter a string cleaned and escaped for output in JavaScript.

	 *

	 * Text passed to esc_js() is stripped of invalid or special characters,

	 * and properly slashed for output.

	 *

	 * @since 2.0.6

	 *

	 * @param string $safe_text The text after it has been escaped.

 	 * @param string $text      The text prior to being escaped.

	 */

	return apply_filters( 'js_escape', $safe_text, $text );

}



/**

 * Escaping for HTML blocks.

 *

 * @since 2.8.0

 *

 * @param string $text

 * @return string

 */

function esc_html( $text ) {

	$safe_text = wp_check_invalid_utf8( $text );

	$safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );

	/**

	 * Filter a string cleaned and escaped for output in HTML.

	 *

	 * Text passed to esc_html() is stripped of invalid or special characters

	 * before output.

	 *

	 * @since 2.8.0

	 *

	 * @param string $safe_text The text after it has been escaped.

 	 * @param string $text      The text prior to being escaped.

	 */

	return apply_filters( 'esc_html', $safe_text, $text );

}



/**

 * Escaping for HTML attributes.

 *

 * @since 2.8.0

 *

 * @param string $text

 * @return string

 */

function esc_attr( $text ) {

	$safe_text = wp_check_invalid_utf8( $text );

	$safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );

	/**

	 * Filter a string cleaned and escaped for output in an HTML attribute.

	 *

	 * Text passed to esc_attr() is stripped of invalid or special characters

	 * before output.

	 *

	 * @since 2.0.6

	 *

	 * @param string $safe_text The text after it has been escaped.

 	 * @param string $text      The text prior to being escaped.

	 */

	return apply_filters( 'attribute_escape', $safe_text, $text );

}



/**

 * Escaping for textarea values.

 *

 * @since 3.1.0

 *

 * @param string $text

 * @return string

 */

function esc_textarea( $text ) {

	$safe_text = htmlspecialchars( $text, ENT_QUOTES, get_option( 'blog_charset' ) );

	/**

	 * Filter a string cleaned and escaped for output in a textarea element.

	 *

	 * @since 3.1.0

	 *

	 * @param string $safe_text The text after it has been escaped.

 	 * @param string $text      The text prior to being escaped.

	 */

	return apply_filters( 'esc_textarea', $safe_text, $text );

}



/**

 * Escape an HTML tag name.

 *

 * @since 2.5.0

 *

 * @param string $tag_name

 * @return string

 */

function tag_escape($tag_name) {

	$safe_tag = strtolower( preg_replace('/[^a-zA-Z0-9_:]/', '', $tag_name) );

	/**

	 * Filter a string cleaned and escaped for output as an HTML tag.

	 *

	 * @since 2.8.0

	 *

	 * @param string $safe_tag The tag name after it has been escaped.

 	 * @param string $tag_name The text before it was escaped.

	 */

	return apply_filters( 'tag_escape', $safe_tag, $tag_name );

}



/**

 * Convert full URL paths to absolute paths.

 *

 * Removes the http or https protocols and the domain. Keeps the path '/' at the

 * beginning, so it isn't a true relative link, but from the web root base.

 *

 * @since 2.1.0

 *

 * @param string $link Full URL path.

 * @return string Absolute path.

 */

function wp_make_link_relative( $link ) {

	return preg_replace( '|https?://[^/]+(/.*)|i', '$1', $link );

}



/**

 * Sanitises various option values based on the nature of the option.

 *

 * This is basically a switch statement which will pass $value through a number

 * of functions depending on the $option.

 *

 * @since 2.0.5

 *

 * @param string $option The name of the option.

 * @param string $value The unsanitised value.

 * @return string Sanitized value.

 */

function sanitize_option($option, $value) {



	switch ( $option ) {

		case 'admin_email' :

		case 'new_admin_email' :

			$value = sanitize_email( $value );

			if ( ! is_email( $value ) ) {

				$value = get_option( $option ); // Resets option to stored value in the case of failed sanitization

				if ( function_exists( 'add_settings_error' ) )

					add_settings_error( $option, 'invalid_admin_email', __( 'The email address entered did not appear to be a valid email address. Please enter a valid email address.' ) );

			}

			break;



		case 'thumbnail_size_w':

		case 'thumbnail_size_h':

		case 'medium_size_w':

		case 'medium_size_h':

		case 'large_size_w':

		case 'large_size_h':

		case 'mailserver_port':

		case 'comment_max_links':

		case 'page_on_front':

		case 'page_for_posts':

		case 'rss_excerpt_length':

		case 'default_category':

		case 'default_email_category':

		case 'default_link_category':

		case 'close_comments_days_old':

		case 'comments_per_page':

		case 'thread_comments_depth':

		case 'users_can_register':

		case 'start_of_week':

			$value = absint( $value );

			break;



		case 'posts_per_page':

		case 'posts_per_rss':

			$value = (int) $value;

			if ( empty($value) )

				$value = 1;

			if ( $value < -1 )

				$value = abs($value);

			break;



		case 'default_ping_status':

		case 'default_comment_status':

			// Options that if not there have 0 value but need to be something like "closed"

			if ( $value == '0' || $value == '')

				$value = 'closed';

			break;



		case 'blogdescription':

		case 'blogname':

			$value = wp_kses_post( $value );

			$value = esc_html( $value );

			break;



		case 'blog_charset':

			$value = preg_replace('/[^a-zA-Z0-9_-]/', '', $value); // strips slashes

			break;



		case 'blog_public':

			// This is the value if the settings checkbox is not checked on POST. Don't rely on this.

			if ( null === $value )

				$value = 1;

			else

				$value = intval( $value );

			break;



		case 'date_format':

		case 'time_format':

		case 'mailserver_url':

		case 'mailserver_login':

		case 'mailserver_pass':

		case 'upload_path':

			$value = strip_tags( $value );

			$value = wp_kses_data( $value );

			break;



		case 'ping_sites':

			$value = explode( "\n", $value );

			$value = array_filter( array_map( 'trim', $value ) );

			$value = array_filter( array_map( 'esc_url_raw', $value ) );

			$value = implode( "\n", $value );

			break;



		case 'gmt_offset':

			$value = preg_replace('/[^0-9:.-]/', '', $value); // strips slashes

			break;



		case 'siteurl':

			if ( (bool)preg_match( '#http(s?)://(.+)#i', $value) ) {

				$value = esc_url_raw($value);

			} else {

				$value = get_option( $option ); // Resets option to stored value in the case of failed sanitization

				if ( function_exists('add_settings_error') )

					add_settings_error('siteurl', 'invalid_siteurl', __('The WordPress address you entered did not appear to be a valid URL. Please enter a valid URL.'));

			}

			break;



		case 'home':

			if ( (bool)preg_match( '#http(s?)://(.+)#i', $value) ) {

				$value = esc_url_raw($value);

			} else {

				$value = get_option( $option ); // Resets option to stored value in the case of failed sanitization

				if ( function_exists('add_settings_error') )

					add_settings_error('home', 'invalid_home', __('The Site address you entered did not appear to be a valid URL. Please enter a valid URL.'));

			}

			break;



		case 'WPLANG':

			$allowed = get_available_languages();

			if ( ! is_multisite() && defined( 'WPLANG' ) && '' !== WPLANG && 'en_US' !== WPLANG ) {

				$allowed[] = WPLANG;

			}

			if ( ! in_array( $value, $allowed ) && ! empty( $value ) ) {

				$value = get_option( $option );

			}

			break;



		case 'illegal_names':

			if ( ! is_array( $value ) )

				$value = explode( ' ', $value );



			$value = array_values( array_filter( array_map( 'trim', $value ) ) );



			if ( ! $value )

				$value = '';

			break;



		case 'limited_email_domains':

		case 'banned_email_domains':

			if ( ! is_array( $value ) )

				$value = explode( "\n", $value );



			$domains = array_values( array_filter( array_map( 'trim', $value ) ) );

			$value = array();



			foreach ( $domains as $domain ) {

				if ( ! preg_match( '/(--|\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) )

					$value[] = $domain;

			}

			if ( ! $value )

				$value = '';

			break;



		case 'timezone_string':

			$allowed_zones = timezone_identifiers_list();

			if ( ! in_array( $value, $allowed_zones ) && ! empty( $value ) ) {

				$value = get_option( $option ); // Resets option to stored value in the case of failed sanitization

				if ( function_exists('add_settings_error') )

					add_settings_error('timezone_string', 'invalid_timezone_string', __('The timezone you have entered is not valid. Please select a valid timezone.') );

			}

			break;



		case 'permalink_structure':

		case 'category_base':

		case 'tag_base':

			$value = esc_url_raw( $value );

			$value = str_replace( 'http://', '', $value );

			break;



		case 'default_role' :

			if ( ! get_role( $value ) && get_role( 'subscriber' ) )

				$value = 'subscriber';

			break;



		case 'moderation_keys':

		case 'blacklist_keys':

			$value = explode( "\n", $value );

			$value = array_filter( array_map( 'trim', $value ) );

			$value = array_unique( $value );

			$value = implode( "\n", $value );

			break;

	}



	/**

	 * Filter an option value following sanitization.

	 *

	 * @since 2.3.0

	 *

	 * @param string $value  The sanitized option value.

	 * @param string $option The option name.

	 */

	$value = apply_filters( "sanitize_option_{$option}", $value, $option );



	return $value;

}



/**

 * Parses a string into variables to be stored in an array.

 *

 * Uses {@link http://www.php.net/parse_str parse_str()} and stripslashes if

 * {@link http://www.php.net/magic_quotes magic_quotes_gpc} is on.

 *

 * @since 2.2.1

 *

 * @param string $string The string to be parsed.

 * @param array $array Variables will be stored in this array.

 */

function wp_parse_str( $string, &$array ) {

	parse_str( $string, $array );

	if ( get_magic_quotes_gpc() )

		$array = stripslashes_deep( $array );

	/**

	 * Filter the array of variables derived from a parsed string.

	 *

	 * @since 2.3.0

	 *

	 * @param array $array The array populated with variables.

	 */

	$array = apply_filters( 'wp_parse_str', $array );

}



/**

 * Convert lone less than signs.

 *

 * KSES already converts lone greater than signs.

 *

 * @uses wp_pre_kses_less_than_callback in the callback function.

 * @since 2.3.0

 *

 * @param string $text Text to be converted.

 * @return string Converted text.

 */

function wp_pre_kses_less_than( $text ) {

	return preg_replace_callback('%<[^>]*?((?=<)|>|$)%', 'wp_pre_kses_less_than_callback', $text);

}



/**

 * Callback function used by preg_replace.

 *

 * @uses esc_html to format the $matches text.

 * @since 2.3.0

 *

 * @param array $matches Populated by matches to preg_replace.

 * @return string The text returned after esc_html if needed.

 */

function wp_pre_kses_less_than_callback( $matches ) {

	if ( false === strpos($matches[0], '>') )

		return esc_html($matches[0]);

	return $matches[0];

}



/**

 * WordPress implementation of PHP sprintf() with filters.

 *

 * @since 2.5.0

 * @link http://www.php.net/sprintf

 *

 * @param string $pattern The string which formatted args are inserted.

 * @param mixed $args,... Arguments to be formatted into the $pattern string.

 * @return string The formatted string.

 */

function wp_sprintf( $pattern ) {

	$args = func_get_args();

	$len = strlen($pattern);

	$start = 0;

	$result = '';

	$arg_index = 0;

	while ( $len > $start ) {

		// Last character: append and break

		if ( strlen($pattern) - 1 == $start ) {

			$result .= substr($pattern, -1);

			break;

		}



		// Literal %: append and continue

		if ( substr($pattern, $start, 2) == '%%' ) {

			$start += 2;

			$result .= '%';

			continue;

		}



		// Get fragment before next %

		$end = strpos($pattern, '%', $start + 1);

		if ( false === $end )

			$end = $len;

		$fragment = substr($pattern, $start, $end - $start);



		// Fragment has a specifier

		if ( $pattern[$start] == '%' ) {

			// Find numbered arguments or take the next one in order

			if ( preg_match('/^%(\d+)\$/', $fragment, $matches) ) {

				$arg = isset($args[$matches[1]]) ? $args[$matches[1]] : '';

				$fragment = str_replace("%{$matches[1]}$", '%', $fragment);

			} else {

				++$arg_index;

				$arg = isset($args[$arg_index]) ? $args[$arg_index] : '';

			}



			/**

			 * Filter a fragment from the pattern passed to wp_sprintf().

			 *

			 * If the fragment is unchanged, then sprintf() will be run on the fragment.

			 *

			 * @since 2.5.0

			 *

			 * @param string $fragment A fragment from the pattern.

			 * @param string $arg      The argument.

			 */

			$_fragment = apply_filters( 'wp_sprintf', $fragment, $arg );

			if ( $_fragment != $fragment )

				$fragment = $_fragment;

			else

				$fragment = sprintf($fragment, strval($arg) );

		}



		// Append to result and move to next fragment

		$result .= $fragment;

		$start = $end;

	}

	return $result;

}



/**

 * Localize list items before the rest of the content.

 *

 * The '%l' must be at the first characters can then contain the rest of the

 * content. The list items will have ', ', ', and', and ' and ' added depending

 * on the amount of list items in the $args parameter.

 *

 * @since 2.5.0

 *

 * @param string $pattern Content containing '%l' at the beginning.

 * @param array $args List items to prepend to the content and replace '%l'.

 * @return string Localized list items and rest of the content.

 */

function wp_sprintf_l($pattern, $args) {

	// Not a match

	if ( substr($pattern, 0, 2) != '%l' )

		return $pattern;



	// Nothing to work with

	if ( empty($args) )

		return '';



	/**

	 * Filter the translated delimiters used by wp_sprintf_l().

	 * Placeholders (%s) are included to assist translators and then

	 * removed before the array of strings reaches the filter.

	 *

	 * Please note: Ampersands and entities should be avoided here.

	 *

	 * @since 2.5.0

	 *

	 * @param array $delimiters An array of translated delimiters.

	 */

	$l = apply_filters( 'wp_sprintf_l', array(

		/* translators: used to join items in a list with more than 2 items */

		'between'          => sprintf( __('%s, %s'), '', '' ),

		/* translators: used to join last two items in a list with more than 2 times */

		'between_last_two' => sprintf( __('%s, and %s'), '', '' ),

		/* translators: used to join items in a list with only 2 items */

		'between_only_two' => sprintf( __('%s and %s'), '', '' ),

	) );



	$args = (array) $args;

	$result = array_shift($args);

	if ( count($args) == 1 )

		$result .= $l['between_only_two'] . array_shift($args);

	// Loop when more than two args

	$i = count($args);

	while ( $i ) {

		$arg = array_shift($args);

		$i--;

		if ( 0 == $i )

			$result .= $l['between_last_two'] . $arg;

		else

			$result .= $l['between'] . $arg;

	}

	return $result . substr($pattern, 2);

}



/**

 * Safely extracts not more than the first $count characters from html string.

 *

 * UTF-8, tags and entities safe prefix extraction. Entities inside will *NOT*

 * be counted as one character. For example &amp; will be counted as 4, &lt; as

 * 3, etc.

 *

 * @since 2.5.0

 *

 * @param string $str String to get the excerpt from.

 * @param integer $count Maximum number of characters to take.

 * @param string $more Optional. What to append if $str needs to be trimmed. Defaults to empty string.

 * @return string The excerpt.

 */

function wp_html_excerpt( $str, $count, $more = null ) {

	if ( null === $more )

		$more = '';

	$str = wp_strip_all_tags( $str, true );

	$excerpt = mb_substr( $str, 0, $count );

	// remove part of an entity at the end

	$excerpt = preg_replace( '/&[^;\s]{0,6}$/', '', $excerpt );

	if ( $str != $excerpt )

		$excerpt = trim( $excerpt ) . $more;

	return $excerpt;

}



/**

 * Add a Base url to relative links in passed content.

 *

 * By default it supports the 'src' and 'href' attributes. However this can be

 * changed via the 3rd param.

 *

 * @since 2.7.0

 *

 * @param string $content String to search for links in.

 * @param string $base The base URL to prefix to links.

 * @param array $attrs The attributes which should be processed.

 * @return string The processed content.

 */

function links_add_base_url( $content, $base, $attrs = array('src', 'href') ) {

	global $_links_add_base;

	$_links_add_base = $base;

	$attrs = implode('|', (array)$attrs);

	return preg_replace_callback( "!($attrs)=(['\"])(.+?)\\2!i", '_links_add_base', $content );

}



/**

 * Callback to add a base url to relative links in passed content.

 *

 * @since 2.7.0

 * @access private

 *

 * @param string $m The matched link.

 * @return string The processed link.

 */

function _links_add_base($m) {

	global $_links_add_base;

	//1 = attribute name  2 = quotation mark  3 = URL

	return $m[1] . '=' . $m[2] .

		( preg_match( '#^(\w{1,20}):#', $m[3], $protocol ) && in_array( $protocol[1], wp_allowed_protocols() ) ?

			$m[3] :

			path_join( $_links_add_base, $m[3] ) )

		. $m[2];

}



/**

 * Adds a Target attribute to all links in passed content.

 *

 * This function by default only applies to <a> tags, however this can be

 * modified by the 3rd param.

 *

 * <b>NOTE:</b> Any current target attributed will be stripped and replaced.

 *

 * @since 2.7.0

 *

 * @param string $content String to search for links in.

 * @param string $target The Target to add to the links.

 * @param array $tags An array of tags to apply to.

 * @return string The processed content.

 */

function links_add_target( $content, $target = '_blank', $tags = array('a') ) {

	global $_links_add_target;

	$_links_add_target = $target;

	$tags = implode('|', (array)$tags);

	return preg_replace_callback( "!<($tags)([^>]*)>!i", '_links_add_target', $content );

}



/**

 * Callback to add a target attribute to all links in passed content.

 *

 * @since 2.7.0

 * @access private

 *

 * @param string $m The matched link.

 * @return string The processed link.

 */

function _links_add_target( $m ) {

	global $_links_add_target;

	$tag = $m[1];

	$link = preg_replace('|( target=([\'"])(.*?)\2)|i', '', $m[2]);

	return '<' . $tag . $link . ' target="' . esc_attr( $_links_add_target ) . '">';

}



/**

 * Normalize EOL characters and strip duplicate whitespace.

 *

 * @since 2.7.0

 *

 * @param string $str The string to normalize.

 * @return string The normalized string.

 */

function normalize_whitespace( $str ) {

	$str  = trim( $str );

	$str  = str_replace( "\r", "\n", $str );

	$str  = preg_replace( array( '/\n+/', '/[ \t]+/' ), array( "\n", ' ' ), $str );

	return $str;

}



/**

 * Properly strip all HTML tags including script and style

 *

 * This differs from strip_tags() because it removes the contents of

 * the <script> and <style> tags. E.g. strip_tags( '<script>something</script>' )

 * will return 'something'. wp_strip_all_tags will return ''

 *

 * @since 2.9.0

 *

 * @param string $string String containing HTML tags

 * @param bool $remove_breaks optional Whether to remove left over line breaks and white space chars

 * @return string The processed string.

 */

function wp_strip_all_tags($string, $remove_breaks = false) {

	$string = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $string );

	$string = strip_tags($string);



	if ( $remove_breaks )

		$string = preg_replace('/[\r\n\t ]+/', ' ', $string);



	return trim( $string );

}



/**

 * Sanitize a string from user input or from the db

 *

 * check for invalid UTF-8,

 * Convert single < characters to entity,

 * strip all tags,

 * remove line breaks, tabs and extra white space,

 * strip octets.

 *

 * @since 2.9.0

 *

 * @param string $str

 * @return string

 */

function sanitize_text_field($str) {

	$filtered = wp_check_invalid_utf8( $str );



	if ( strpos($filtered, '<') !== false ) {

		$filtered = wp_pre_kses_less_than( $filtered );

		// This will strip extra whitespace for us.

		$filtered = wp_strip_all_tags( $filtered, true );

	} else {

		$filtered = trim( preg_replace('/[\r\n\t ]+/', ' ', $filtered) );

	}



	$found = false;

	while ( preg_match('/%[a-f0-9]{2}/i', $filtered, $match) ) {

		$filtered = str_replace($match[0], '', $filtered);

		$found = true;

	}



	if ( $found ) {

		// Strip out the whitespace that may now exist after removing the octets.

		$filtered = trim( preg_replace('/ +/', ' ', $filtered) );

	}



	/**

	 * Filter a sanitized text field string.

	 *

	 * @since 2.9.0

	 *

	 * @param string $filtered The sanitized string.

	 * @param string $str      The string prior to being sanitized.

	 */

	return apply_filters( 'sanitize_text_field', $filtered, $str );

}



/**

 * i18n friendly version of basename()

 *

 * @since 3.1.0

 *

 * @param string $path A path.

 * @param string $suffix If the filename ends in suffix this will also be cut off.

 * @return string

 */

function wp_basename( $path, $suffix = '' ) {

	return urldecode( basename( str_replace( array( '%2F', '%5C' ), '/', urlencode( $path ) ), $suffix ) );

}



/**

 * Forever eliminate "Wordpress" from the planet (or at least the little bit we can influence).

 *

 * Violating our coding standards for a good function name.

 *

 * @since 3.0.0

 */

function capital_P_dangit( $text ) {

	// Simple replacement for titles

	$current_filter = current_filter();

	if ( 'the_title' === $current_filter || 'wp_title' === $current_filter )

		return str_replace( 'Wordpress', 'WordPress', $text );

	// Still here? Use the more judicious replacement

	static $dblq = false;

	if ( false === $dblq )

		$dblq = _x( '&#8220;', 'opening curly double quote' );

	return str_replace(

		array( ' Wordpress', '&#8216;Wordpress', $dblq . 'Wordpress', '>Wordpress', '(Wordpress' ),

		array( ' WordPress', '&#8216;WordPress', $dblq . 'WordPress', '>WordPress', '(WordPress' ),

	$text );



}



/**

 * Sanitize a mime type

 *

 * @since 3.1.3

 *

 * @param string $mime_type Mime type

 * @return string Sanitized mime type

 */

function sanitize_mime_type( $mime_type ) {

	$sani_mime_type = preg_replace( '/[^-+*.a-zA-Z0-9\/]/', '', $mime_type );

	/**

	 * Filter a mime type following sanitization.

	 *

	 * @since 3.1.3

	 *

	 * @param string $sani_mime_type The sanitized mime type.

	 * @param string $mime_type      The mime type prior to sanitization.

	 */

	return apply_filters( 'sanitize_mime_type', $sani_mime_type, $mime_type );

}



/**

 * Sanitize space or carriage return separated URLs that are used to send trackbacks.

 *

 * @since 3.4.0

 *

 * @param string $to_ping Space or carriage return separated URLs

 * @return string URLs starting with the http or https protocol, separated by a carriage return.

 */

function sanitize_trackback_urls( $to_ping ) {

	$urls_to_ping = preg_split( '/[\r\n\t ]/', trim( $to_ping ), -1, PREG_SPLIT_NO_EMPTY );

	foreach ( $urls_to_ping as $k => $url ) {

		if ( !preg_match( '#^https?://.#i', $url ) )

			unset( $urls_to_ping[$k] );

	}

	$urls_to_ping = array_map( 'esc_url_raw', $urls_to_ping );

	$urls_to_ping = implode( "\n", $urls_to_ping );

	/**

	 * Filter a list of trackback URLs following sanitization.

	 *

	 * The string returned here consists of a space or carriage return-delimited list

	 * of trackback URLs.

	 *

	 * @since 3.4.0

	 *

	 * @param string $urls_to_ping Sanitized space or carriage return separated URLs.

	 * @param string $to_ping      Space or carriage return separated URLs before sanitization.

	 */

	return apply_filters( 'sanitize_trackback_urls', $urls_to_ping, $to_ping );

}



/**

 * Add slashes to a string or array of strings.

 *

 * This should be used when preparing data for core API that expects slashed data.

 * This should not be used to escape data going directly into an SQL query.

 *

 * @since 3.6.0

 *

 * @param string|array $value String or array of strings to slash.

 * @return string|array Slashed $value

 */

function wp_slash( $value ) {

	if ( is_array( $value ) ) {

		foreach ( $value as $k => $v ) {

			if ( is_array( $v ) ) {

				$value[$k] = wp_slash( $v );

			} else {

				$value[$k] = addslashes( $v );

			}

		}

	} else {

		$value = addslashes( $value );

	}



	return $value;

}



/**

 * Remove slashes from a string or array of strings.

 *

 * This should be used to remove slashes from data passed to core API that

 * expects data to be unslashed.

 *

 * @since 3.6.0

 *

 * @param string|array $value String or array of strings to unslash.

 * @return string|array Unslashed $value

 */

function wp_unslash( $value ) {

	return stripslashes_deep( $value );

}



/**

 * Extract and return the first URL from passed content.

 *

 * @since 3.6.0

 *

 * @param string $content A string which might contain a URL.

 * @return string The found URL.

 */

function get_url_in_content( $content ) {

	if ( empty( $content ) ) {

		return false;

	}



	if ( preg_match( '/<a\s[^>]*?href=([\'"])(.+?)\1/is', $content, $matches ) ) {

		return esc_url_raw( $matches[2] );

	}



	return false;

}



/**

 * Returns the regexp for common whitespace characters.

 *

 * By default, spaces include new lines, tabs, nbsp entities, and the UTF-8 nbsp.

 * This is designed to replace the PCRE \s sequence.  In ticket #22692, that

 * sequence was found to be unreliable due to random inclusion of the A0 byte.

 *

 * @since 4.0.0

 *

 * @return string The spaces regexp.

 */

function wp_spaces_regexp() {

	static $spaces;



	if ( empty( $spaces ) ) {

		/**

		 * Filter the regexp for common whitespace characters.

		 *

		 * This string is substituted for the \s sequence as needed in regular

		 * expressions. For websites not written in English, different characters

		 * may represent whitespace. For websites not encoded in UTF-8, the 0xC2 0xA0

		 * sequence may not be in use.

		 *

		 * @since 4.0.0

		 *

		 * @param string $spaces Regexp pattern for matching common whitespace characters.

		 */

		$spaces = apply_filters( 'wp_spaces_regexp', '[\r\n\t ]|\xC2\xA0|&nbsp;' );

	}



	return $spaces;

}