/wp-includes/theme.php

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<?php

/**

 * Theme, template, and stylesheet functions.

 *

 * @package WordPress

 * @subpackage Template

 */



/**

 * Whether a child theme is in use.

 *

 * @since 3.0.0

 *

 * @return bool true if a child theme is in use, false otherwise.

 **/

function is_child_theme() {

	return ( TEMPLATEPATH !== STYLESHEETPATH );

}



/**

 * Retrieve name of the current stylesheet.

 *

 * The theme name that the administrator has currently set the front end theme

 * as.

 *

 * For all extensive purposes, the template name and the stylesheet name are

 * going to be the same for most cases.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'stylesheet' filter on stylesheet name.

 *

 * @return string Stylesheet name.

 */

function get_stylesheet() {

	return apply_filters('stylesheet', get_option('stylesheet'));

}



/**

 * Retrieve stylesheet directory path for current theme.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'stylesheet_directory' filter on stylesheet directory and theme name.

 *

 * @return string Path to current theme directory.

 */

function get_stylesheet_directory() {

	$stylesheet = get_stylesheet();

	$theme_root = get_theme_root( $stylesheet );

	$stylesheet_dir = "$theme_root/$stylesheet";



	return apply_filters( 'stylesheet_directory', $stylesheet_dir, $stylesheet, $theme_root );

}



/**

 * Retrieve stylesheet directory URI.

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_stylesheet_directory_uri() {

	$stylesheet = get_stylesheet();

	$theme_root_uri = get_theme_root_uri( $stylesheet );

	$stylesheet_dir_uri = "$theme_root_uri/$stylesheet";



	return apply_filters( 'stylesheet_directory_uri', $stylesheet_dir_uri, $stylesheet, $theme_root_uri );

}



/**

 * Retrieve URI of current theme stylesheet.

 *

 * The stylesheet file name is 'style.css' which is appended to {@link

 * get_stylesheet_directory_uri() stylesheet directory URI} path.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'stylesheet_uri' filter on stylesheet URI path and stylesheet directory URI.

 *

 * @return string

 */

function get_stylesheet_uri() {

	$stylesheet_dir_uri = get_stylesheet_directory_uri();

	$stylesheet_uri = $stylesheet_dir_uri . '/style.css';

	return apply_filters('stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri);

}



/**

 * Retrieve localized stylesheet URI.

 *

 * The stylesheet directory for the localized stylesheet files are located, by

 * default, in the base theme directory. The name of the locale file will be the

 * locale followed by '.css'. If that does not exist, then the text direction

 * stylesheet will be checked for existence, for example 'ltr.css'.

 *

 * The theme may change the location of the stylesheet directory by either using

 * the 'stylesheet_directory_uri' filter or the 'locale_stylesheet_uri' filter.

 * If you want to change the location of the stylesheet files for the entire

 * WordPress workflow, then change the former. If you just have the locale in a

 * separate folder, then change the latter.

 *

 * @since 2.1.0

 * @uses apply_filters() Calls 'locale_stylesheet_uri' filter on stylesheet URI path and stylesheet directory URI.

 *

 * @return string

 */

function get_locale_stylesheet_uri() {

	global $wp_locale;

	$stylesheet_dir_uri = get_stylesheet_directory_uri();

	$dir = get_stylesheet_directory();

	$locale = get_locale();

	if ( file_exists("$dir/$locale.css") )

		$stylesheet_uri = "$stylesheet_dir_uri/$locale.css";

	elseif ( !empty($wp_locale->text_direction) && file_exists("$dir/{$wp_locale->text_direction}.css") )

		$stylesheet_uri = "$stylesheet_dir_uri/{$wp_locale->text_direction}.css";

	else

		$stylesheet_uri = '';

	return apply_filters('locale_stylesheet_uri', $stylesheet_uri, $stylesheet_dir_uri);

}



/**

 * Retrieve name of the current theme.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'template' filter on template option.

 *

 * @return string Template name.

 */

function get_template() {

	return apply_filters('template', get_option('template'));

}



/**

 * Retrieve current theme directory.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'template_directory' filter on template directory path and template name.

 *

 * @return string Template directory path.

 */

function get_template_directory() {

	$template = get_template();

	$theme_root = get_theme_root( $template );

	$template_dir = "$theme_root/$template";



	return apply_filters( 'template_directory', $template_dir, $template, $theme_root );

}



/**

 * Retrieve theme directory URI.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'template_directory_uri' filter on template directory URI path and template name.

 *

 * @return string Template directory URI.

 */

function get_template_directory_uri() {

	$template = get_template();

	$theme_root_uri = get_theme_root_uri( $template );

	$template_dir_uri = "$theme_root_uri/$template";



	return apply_filters( 'template_directory_uri', $template_dir_uri, $template, $theme_root_uri );

}



/**

 * Retrieve theme data from parsed theme file.

 *

 * The description will have the tags filtered with the following HTML elements

 * whitelisted. The <b>'a'</b> element with the <em>href</em> and <em>title</em>

 * attributes. The <b>abbr</b> element with the <em>title</em> attribute. The

 * <b>acronym</b> element with the <em>title</em> attribute allowed. The

 * <b>code</b>, <b>em</b>, and <b>strong</b> elements also allowed.

 *

 * The style.css file must contain theme name, theme URI, and description. The

 * data can also contain author URI, author, template (parent template),

 * version, status, and finally tags. Some of these are not used by WordPress

 * administration panels, but are used by theme directory web sites which list

 * the theme.

 *

 * @since 1.5.0

 *

 * @param string $theme_file Theme file path.

 * @return array Theme data.

 */

function get_theme_data( $theme_file ) {

	$default_headers = array(

		'Name' => 'Theme Name',

		'URI' => 'Theme URI',

		'Description' => 'Description',

		'Author' => 'Author',

		'AuthorURI' => 'Author URI',

		'Version' => 'Version',

		'Template' => 'Template',

		'Status' => 'Status',

		'Tags' => 'Tags'

		);



	$themes_allowed_tags = array(

		'a' => array(

			'href' => array(),'title' => array()

			),

		'abbr' => array(

			'title' => array()

			),

		'acronym' => array(

			'title' => array()

			),

		'code' => array(),

		'em' => array(),

		'strong' => array()

	);



	$theme_data = get_file_data( $theme_file, $default_headers, 'theme' );



	$theme_data['Name'] = $theme_data['Title'] = wp_kses( $theme_data['Name'], $themes_allowed_tags );



	$theme_data['URI'] = esc_url( $theme_data['URI'] );



	$theme_data['Description'] = wptexturize( wp_kses( $theme_data['Description'], $themes_allowed_tags ) );



	$theme_data['AuthorURI'] = esc_url( $theme_data['AuthorURI'] );



	$theme_data['Template'] = wp_kses( $theme_data['Template'], $themes_allowed_tags );



	$theme_data['Version'] = wp_kses( $theme_data['Version'], $themes_allowed_tags );



	if ( $theme_data['Status'] == '' )

		$theme_data['Status'] = 'publish';

	else

		$theme_data['Status'] = wp_kses( $theme_data['Status'], $themes_allowed_tags );



	if ( $theme_data['Tags'] == '' )

		$theme_data['Tags'] = array();

	else

		$theme_data['Tags'] = array_map( 'trim', explode( ',', wp_kses( $theme_data['Tags'], array() ) ) );



	if ( $theme_data['Author'] == '' ) {

		$theme_data['Author'] = $theme_data['AuthorName'] = __('Anonymous');

	} else {

		$theme_data['AuthorName'] = wp_kses( $theme_data['Author'], $themes_allowed_tags );

		if ( empty( $theme_data['AuthorURI'] ) ) {

			$theme_data['Author'] = $theme_data['AuthorName'];

		} else {

			$theme_data['Author'] = sprintf( '<a href="%1$s" title="%2$s">%3$s</a>', $theme_data['AuthorURI'], esc_attr__( 'Visit author homepage' ), $theme_data['AuthorName'] );

		}

	}



	return $theme_data;

}



/**

 * Retrieve list of themes with theme data in theme directory.

 *

 * The theme is broken, if it doesn't have a parent theme and is missing either

 * style.css and, or index.php. If the theme has a parent theme then it is

 * broken, if it is missing style.css; index.php is optional. The broken theme

 * list is saved in the {@link $wp_broken_themes} global, which is displayed on

 * the theme list in the administration panels.

 *

 * @since 1.5.0

 * @global array $wp_broken_themes Stores the broken themes.

 * @global array $wp_themes Stores the working themes.

 *

 * @return array Theme list with theme data.

 */

function get_themes() {

	global $wp_themes, $wp_broken_themes;



	if ( isset($wp_themes) )

		return $wp_themes;



	if ( !$theme_files = search_theme_directories() )

		return false;



	asort( $theme_files );



	$wp_themes = array();



	foreach ( (array) $theme_files as $theme_file ) {

		$theme_root = $theme_file['theme_root'];

		$theme_file = $theme_file['theme_file'];



		if ( !is_readable("$theme_root/$theme_file") ) {

			$wp_broken_themes[$theme_file] = array('Name' => $theme_file, 'Title' => $theme_file, 'Description' => __('File not readable.'));

			continue;

		}



		$theme_data = get_theme_data("$theme_root/$theme_file");



		$name        = $theme_data['Name'];

		$title       = $theme_data['Title'];

		$description = wptexturize($theme_data['Description']);

		$version     = $theme_data['Version'];

		$author      = $theme_data['Author'];

		$template    = $theme_data['Template'];

		$stylesheet  = dirname($theme_file);



		$screenshot = false;

		foreach ( array('png', 'gif', 'jpg', 'jpeg') as $ext ) {

			if (file_exists("$theme_root/$stylesheet/screenshot.$ext")) {

				$screenshot = "screenshot.$ext";

				break;

			}

		}



		if ( empty($name) ) {

			$name = dirname($theme_file);

			$title = $name;

		}



		$parent_template = $template;



		if ( empty($template) ) {

			if ( file_exists("$theme_root/$stylesheet/index.php") )

				$template = $stylesheet;

			else

				continue;

		}



		$template = trim( $template );



		if ( !file_exists("$theme_root/$template/index.php") ) {

			$parent_dir = dirname(dirname($theme_file));

			if ( file_exists("$theme_root/$parent_dir/$template/index.php") ) {

				$template = "$parent_dir/$template";

				$template_directory = "$theme_root/$template";

			} else {

				/**

				 * The parent theme doesn't exist in the current theme's folder or sub folder

				 * so lets use the theme root for the parent template.

				 */

				if ( isset($theme_files[$template]) && file_exists( $theme_files[$template]['theme_root'] . "/$template/index.php" ) ) {

					$template_directory = $theme_files[$template]['theme_root'] . "/$template";

				} else {

					if ( empty( $parent_template) )

						$wp_broken_themes[$name] = array('Name' => $name, 'Title' => $title, 'Description' => __('Template is missing.'), 'error' => 'no_template');

					else

						$wp_broken_themes[$name] = array('Name' => $name, 'Title' => $title, 'Description' => sprintf( __('The parent theme is missing. Please install the "%s" parent theme.'),  $parent_template ), 'error' => 'no_parent', 'parent' => $parent_template );

					continue;

				}



			}

		} else {

			$template_directory = trim( $theme_root . '/' . $template );

		}



		$stylesheet_files = array();

		$template_files = array();



		$stylesheet_dir = @ dir("$theme_root/$stylesheet");

		if ( $stylesheet_dir ) {

			while ( ($file = $stylesheet_dir->read()) !== false ) {

				if ( !preg_match('|^\.+$|', $file) ) {

					if ( preg_match('|\.css$|', $file) )

						$stylesheet_files[] = "$theme_root/$stylesheet/$file";

					elseif ( preg_match('|\.php$|', $file) )

						$template_files[] = "$theme_root/$stylesheet/$file";

				}

			}

			@ $stylesheet_dir->close();

		}



		$template_dir = @ dir("$template_directory");

		if ( $template_dir ) {

			while ( ($file = $template_dir->read()) !== false ) {

				if ( preg_match('|^\.+$|', $file) )

					continue;

				if ( preg_match('|\.php$|', $file) ) {

					$template_files[] = "$template_directory/$file";

				} elseif ( is_dir("$template_directory/$file") ) {

					$template_subdir = @ dir("$template_directory/$file");

					if ( !$template_subdir )

						continue;

					while ( ($subfile = $template_subdir->read()) !== false ) {

						if ( preg_match('|^\.+$|', $subfile) )

							continue;

						if ( preg_match('|\.php$|', $subfile) )

							$template_files[] = "$template_directory/$file/$subfile";

					}

					@ $template_subdir->close();

				}

			}

			@ $template_dir->close();

		}



		//Make unique and remove duplicates when stylesheet and template are the same i.e. most themes

		$template_files = array_unique($template_files);

		$stylesheet_files = array_unique($stylesheet_files);



		$template_dir = $template_directory;

		$stylesheet_dir = $theme_root . '/' . $stylesheet;



		if ( empty($template_dir) )

			$template_dir = '/';

		if ( empty($stylesheet_dir) )

			$stylesheet_dir = '/';



		// Check for theme name collision.  This occurs if a theme is copied to

		// a new theme directory and the theme header is not updated.  Whichever

		// theme is first keeps the name.  Subsequent themes get a suffix applied.

		// The Twenty Eleven, Twenty Ten, Default and Classic themes always trump

		// their pretenders.

		if ( isset($wp_themes[$name]) ) {

			$trump_cards = array(

				'classic'      => 'WordPress Classic',

				'default'      => 'WordPress Default',

				'twentyten'    => 'Twenty Ten',

				'twentyeleven' => 'Twenty Eleven',

			);

			if ( isset( $trump_cards[ $stylesheet ] ) && $name == $trump_cards[ $stylesheet ] ) {

				// If another theme has claimed to be one of our default themes, move

				// them aside.

				$suffix = $wp_themes[$name]['Stylesheet'];

				$new_name = "$name/$suffix";

				$wp_themes[$new_name] = $wp_themes[$name];

				$wp_themes[$new_name]['Name'] = $new_name;

			} else {

				$name = "$name/$stylesheet";

			}

		}



		$theme_roots[$stylesheet] = str_replace( WP_CONTENT_DIR, '', $theme_root );

		$wp_themes[$name] = array(

			'Name' => $name,

			'Title' => $title,

			'Description' => $description,

			'Author' => $author,

			'Author Name' => $theme_data['AuthorName'],

			'Author URI' => $theme_data['AuthorURI'],

			'Version' => $version,

			'Template' => $template,

			'Stylesheet' => $stylesheet,

			'Template Files' => $template_files,

			'Stylesheet Files' => $stylesheet_files,

			'Template Dir' => $template_dir,

			'Stylesheet Dir' => $stylesheet_dir,

			'Status' => $theme_data['Status'],

			'Screenshot' => $screenshot,

			'Tags' => $theme_data['Tags'],

			'Theme Root' => $theme_root,

			'Theme Root URI' => str_replace( WP_CONTENT_DIR, content_url(), $theme_root ),

		);

	}



	unset($theme_files);



	/* Store theme roots in the DB */

	if ( get_site_transient( 'theme_roots' ) != $theme_roots )

		set_site_transient( 'theme_roots', $theme_roots, 7200 ); // cache for two hours

	unset($theme_roots);



	/* Resolve theme dependencies. */

	$theme_names = array_keys( $wp_themes );

	foreach ( (array) $theme_names as $theme_name ) {

		$wp_themes[$theme_name]['Parent Theme'] = '';

		if ( $wp_themes[$theme_name]['Stylesheet'] != $wp_themes[$theme_name]['Template'] ) {

			foreach ( (array) $theme_names as $parent_theme_name ) {

				if ( ($wp_themes[$parent_theme_name]['Stylesheet'] == $wp_themes[$parent_theme_name]['Template']) && ($wp_themes[$parent_theme_name]['Template'] == $wp_themes[$theme_name]['Template']) ) {

					$wp_themes[$theme_name]['Parent Theme'] = $wp_themes[$parent_theme_name]['Name'];

					break;

				}

			}

		}

	}



	return $wp_themes;

}



/**

 * Retrieve theme roots.

 *

 * @since 2.9.0

 *

 * @return array|string An arry of theme roots keyed by template/stylesheet or a single theme root if all themes have the same root.

 */

function get_theme_roots() {

	global $wp_theme_directories;



	if ( count($wp_theme_directories) <= 1 )

		return '/themes';



	$theme_roots = get_site_transient( 'theme_roots' );

	if ( false === $theme_roots ) {

		get_themes();

		$theme_roots = get_site_transient( 'theme_roots' ); // this is set in get_theme()

	}

	return $theme_roots;

}



/**

 * Retrieve theme data.

 *

 * @since 1.5.0

 *

 * @param string $theme Theme name.

 * @return array|null Null, if theme name does not exist. Theme data, if exists.

 */

function get_theme($theme) {

	$themes = get_themes();



	if ( array_key_exists($theme, $themes) )

		return $themes[$theme];



	return null;

}



/**

 * Retrieve current theme display name.

 *

 * If the 'current_theme' option has already been set, then it will be returned

 * instead. If it is not set, then each theme will be iterated over until both

 * the current stylesheet and current template name.

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_current_theme() {

	if ( $theme = get_option('current_theme') )

		return $theme;



	$themes = get_themes();

	$theme_names = array_keys($themes);

	$current_template = get_option('template');

	$current_stylesheet = get_option('stylesheet');

	$current_theme = 'Twenty Ten';



	if ( $themes ) {

		foreach ( (array) $theme_names as $theme_name ) {

			if ( $themes[$theme_name]['Stylesheet'] == $current_stylesheet &&

					$themes[$theme_name]['Template'] == $current_template ) {

				$current_theme = $themes[$theme_name]['Name'];

				break;

			}

		}

	}



	update_option('current_theme', $current_theme);



	return $current_theme;

}



/**

 * Register a directory that contains themes.

 *

 * @since 2.9.0

 *

 * @param string $directory Either the full filesystem path to a theme folder or a folder within WP_CONTENT_DIR

 * @return bool

 */

function register_theme_directory( $directory) {

	global $wp_theme_directories;



	/* If this folder does not exist, return and do not register */

	if ( !file_exists( $directory ) )

			/* Try prepending as the theme directory could be relative to the content directory */

		$registered_directory = WP_CONTENT_DIR . '/' . $directory;

	else

		$registered_directory = $directory;



	/* If this folder does not exist, return and do not register */

	if ( !file_exists( $registered_directory ) )

		return false;



	$wp_theme_directories[] = $registered_directory;



	return true;

}



/**

 * Search all registered theme directories for complete and valid themes.

 *

 * @since 2.9.0

 *

 * @return array Valid themes found

 */

function search_theme_directories() {

	global $wp_theme_directories, $wp_broken_themes;

	if ( empty( $wp_theme_directories ) )

		return false;



	$theme_files = array();

	$wp_broken_themes = array();



	/* Loop the registered theme directories and extract all themes */

	foreach ( (array) $wp_theme_directories as $theme_root ) {

		$theme_loc = $theme_root;



		/* We don't want to replace all forward slashes, see Trac #4541 */

		if ( '/' != WP_CONTENT_DIR )

			$theme_loc = str_replace(WP_CONTENT_DIR, '', $theme_root);



		/* Files in the root of the current theme directory and one subdir down */

		$themes_dir = @ opendir($theme_root);



		if ( !$themes_dir )

			return false;



		while ( ($theme_dir = readdir($themes_dir)) !== false ) {

			if ( is_dir($theme_root . '/' . $theme_dir) && is_readable($theme_root . '/' . $theme_dir) ) {

				if ( $theme_dir[0] == '.' || $theme_dir == 'CVS' )

					continue;



				$stylish_dir = @opendir($theme_root . '/' . $theme_dir);

				$found_stylesheet = false;



				while ( ($theme_file = readdir($stylish_dir)) !== false ) {

					if ( $theme_file == 'style.css' ) {

						$theme_files[$theme_dir] = array( 'theme_file' => $theme_dir . '/' . $theme_file, 'theme_root' => $theme_root );

						$found_stylesheet = true;

						break;

					}

				}

				@closedir($stylish_dir);



				if ( !$found_stylesheet ) { // look for themes in that dir

					$subdir = "$theme_root/$theme_dir";

					$subdir_name = $theme_dir;

					$theme_subdirs = @opendir( $subdir );



					$found_subdir_themes = false;

					while ( ($theme_subdir = readdir($theme_subdirs)) !== false ) {

						if ( is_dir( $subdir . '/' . $theme_subdir) && is_readable($subdir . '/' . $theme_subdir) ) {

							if ( $theme_subdir[0] == '.' || $theme_subdir == 'CVS' )

								continue;



							$stylish_dir = @opendir($subdir . '/' . $theme_subdir);

							$found_stylesheet = false;



							while ( ($theme_file = readdir($stylish_dir)) !== false ) {

								if ( $theme_file == 'style.css' ) {

									$theme_files["$theme_dir/$theme_subdir"] = array( 'theme_file' => $subdir_name . '/' . $theme_subdir . '/' . $theme_file, 'theme_root' => $theme_root );

									$found_stylesheet = true;

									$found_subdir_themes = true;

									break;

								}

							}

							@closedir($stylish_dir);

						}

					}

					@closedir($theme_subdirs);

					if ( !$found_subdir_themes )

						$wp_broken_themes[$theme_dir] = array('Name' => $theme_dir, 'Title' => $theme_dir, 'Description' => __('Stylesheet is missing.'));

				}

			}

		}

		@closedir( $themes_dir );

	}

	return $theme_files;

}



/**

 * Retrieve path to themes directory.

 *

 * Does not have trailing slash.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'theme_root' filter on path.

 *

 * @param string $stylesheet_or_template The stylesheet or template name of the theme

 * @return string Theme path.

 */

function get_theme_root( $stylesheet_or_template = false ) {

	if ( $stylesheet_or_template ) {

		if ( $theme_root = get_raw_theme_root($stylesheet_or_template) )

			$theme_root = WP_CONTENT_DIR . $theme_root;

		else

			$theme_root = WP_CONTENT_DIR . '/themes';

	} else {

		$theme_root = WP_CONTENT_DIR . '/themes';

	}



	return apply_filters( 'theme_root', $theme_root );

}



/**

 * Retrieve URI for themes directory.

 *

 * Does not have trailing slash.

 *

 * @since 1.5.0

 *

 * @param string $stylesheet_or_template The stylesheet or template name of the theme

 * @return string Themes URI.

 */

function get_theme_root_uri( $stylesheet_or_template = false ) {

	if ( $stylesheet_or_template ) {

		if ( $theme_root = get_raw_theme_root($stylesheet_or_template) )

			$theme_root_uri = content_url( $theme_root );

		else

			$theme_root_uri = content_url( 'themes' );

	} else {

		$theme_root_uri = content_url( 'themes' );

	}



	return apply_filters( 'theme_root_uri', $theme_root_uri, get_option('siteurl'), $stylesheet_or_template );

}



/**

 * Get the raw theme root relative to the content directory with no filters applied.

 *

 * @since 3.1.0

 *

 * @param string $stylesheet_or_template The stylesheet or template name of the theme

 * @return string Theme root

 */

function get_raw_theme_root( $stylesheet_or_template, $no_cache = false ) {

	global $wp_theme_directories;



	if ( count($wp_theme_directories) <= 1 )

		return '/themes';



	$theme_root = false;



	// If requesting the root for the current theme, consult options to avoid calling get_theme_roots()

	if ( !$no_cache ) {

		if ( get_option('stylesheet') == $stylesheet_or_template )

			$theme_root = get_option('stylesheet_root');

		elseif ( get_option('template') == $stylesheet_or_template )

			$theme_root = get_option('template_root');

	}



	if ( empty($theme_root) ) {

		$theme_roots = get_theme_roots();

		if ( !empty($theme_roots[$stylesheet_or_template]) )

			$theme_root = $theme_roots[$stylesheet_or_template];

	}



	return $theme_root;

}



/**

 * Retrieve path to a template

 *

 * Used to quickly retrieve the path of a template without including the file

 * extension. It will also check the parent theme, if the file exists, with

 * the use of {@link locate_template()}. Allows for more generic template location

 * without the use of the other get_*_template() functions.

 *

 * @since 1.5.0

 *

 * @param string $type Filename without extension.

 * @param array $templates An optional list of template candidates

 * @return string Full path to file.

 */

function get_query_template( $type, $templates = array() ) {

	$type = preg_replace( '|[^a-z0-9-]+|', '', $type );



	if ( empty( $templates ) )

		$templates = array("{$type}.php");



	return apply_filters( "{$type}_template", locate_template( $templates ) );

}



/**

 * Retrieve path of index template in current or parent template.

 *

 * @since 3.0.0

 *

 * @return string

 */

function get_index_template() {

	return get_query_template('index');

}



/**

 * Retrieve path of 404 template in current or parent template.

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_404_template() {

	return get_query_template('404');

}



/**

 * Retrieve path of archive template in current or parent template.

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_archive_template() {

	$post_type = get_query_var( 'post_type' );



	$templates = array();



	if ( $post_type )

		$templates[] = "archive-{$post_type}.php";

	$templates[] = 'archive.php';



	return get_query_template( 'archive', $templates );

}



/**

 * Retrieve path of author template in current or parent template.

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_author_template() {

	$author = get_queried_object();



	$templates = array();



	$templates[] = "author-{$author->user_nicename}.php";

	$templates[] = "author-{$author->ID}.php";

	$templates[] = 'author.php';



	return get_query_template( 'author', $templates );

}



/**

 * Retrieve path of category template in current or parent template.

 *

 * Works by first retrieving the current slug for example 'category-default.php' and then

 * trying category ID, for example 'category-1.php' and will finally fallback to category.php

 * template, if those files don't exist.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'category_template' on file path of category template.

 *

 * @return string

 */

function get_category_template() {

	$category = get_queried_object();



	$templates = array();



	$templates[] = "category-{$category->slug}.php";

	$templates[] = "category-{$category->term_id}.php";

	$templates[] = 'category.php';



	return get_query_template( 'category', $templates );

}



/**

 * Retrieve path of tag template in current or parent template.

 *

 * Works by first retrieving the current tag name, for example 'tag-wordpress.php' and then

 * trying tag ID, for example 'tag-1.php' and will finally fallback to tag.php

 * template, if those files don't exist.

 *

 * @since 2.3.0

 * @uses apply_filters() Calls 'tag_template' on file path of tag template.

 *

 * @return string

 */

function get_tag_template() {

	$tag = get_queried_object();



	$templates = array();



	$templates[] = "tag-{$tag->slug}.php";

	$templates[] = "tag-{$tag->term_id}.php";

	$templates[] = 'tag.php';



	return get_query_template( 'tag', $templates );

}



/**

 * Retrieve path of taxonomy template in current or parent template.

 *

 * Retrieves the taxonomy and term, if term is available. The template is

 * prepended with 'taxonomy-' and followed by both the taxonomy string and

 * the taxonomy string followed by a dash and then followed by the term.

 *

 * The taxonomy and term template is checked and used first, if it exists.

 * Second, just the taxonomy template is checked, and then finally, taxonomy.php

 * template is used. If none of the files exist, then it will fall back on to

 * index.php.

 *

 * @since 2.5.0

 * @uses apply_filters() Calls 'taxonomy_template' filter on found path.

 *

 * @return string

 */

function get_taxonomy_template() {

	$term = get_queried_object();

	$taxonomy = $term->taxonomy;



	$templates = array();



	$templates[] = "taxonomy-$taxonomy-{$term->slug}.php";

	$templates[] = "taxonomy-$taxonomy.php";

	$templates[] = 'taxonomy.php';



	return get_query_template( 'taxonomy', $templates );

}



/**

 * Retrieve path of date template in current or parent template.

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_date_template() {

	return get_query_template('date');

}



/**

 * Retrieve path of home template in current or parent template.

 *

 * This is the template used for the page containing the blog posts

 *

 * Attempts to locate 'home.php' first before falling back to 'index.php'.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'home_template' on file path of home template.

 *

 * @return string

 */

function get_home_template() {

	$templates = array( 'home.php', 'index.php' );



	return get_query_template( 'home', $templates );

}



/**

 * Retrieve path of front-page template in current or parent template.

 *

 * Looks for 'front-page.php'.

 *

 * @since 3.0.0

 * @uses apply_filters() Calls 'front_page_template' on file path of template.

 *

 * @return string

 */

function get_front_page_template() {

	$templates = array('front-page.php');



	return get_query_template( 'front_page', $templates );

}



/**

 * Retrieve path of page template in current or parent template.

 *

 * Will first look for the specifically assigned page template

 * The will search for 'page-{slug}.php' followed by 'page-id.php'

 * and finally 'page.php'

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_page_template() {

	$id = get_queried_object_id();

	$template = get_post_meta($id, '_wp_page_template', true);

	$pagename = get_query_var('pagename');



	if ( !$pagename && $id > 0 ) {

		// If a static page is set as the front page, $pagename will not be set. Retrieve it from the queried object

		$post = get_queried_object();

		$pagename = $post->post_name;

	}



	if ( 'default' == $template )

		$template = '';



	$templates = array();

	if ( !empty($template) && !validate_file($template) )

		$templates[] = $template;

	if ( $pagename )

		$templates[] = "page-$pagename.php";

	if ( $id )

		$templates[] = "page-$id.php";

	$templates[] = 'page.php';



	return get_query_template( 'page', $templates );

}



/**

 * Retrieve path of paged template in current or parent template.

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_paged_template() {

	return get_query_template('paged');

}



/**

 * Retrieve path of search template in current or parent template.

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_search_template() {

	return get_query_template('search');

}



/**

 * Retrieve path of single template in current or parent template.

 *

 * @since 1.5.0

 *

 * @return string

 */

function get_single_template() {

	$object = get_queried_object();



	$templates = array();



	$templates[] = "single-{$object->post_type}.php";

	$templates[] = "single.php";



	return get_query_template( 'single', $templates );

}



/**

 * Retrieve path of attachment template in current or parent template.

 *

 * The attachment path first checks if the first part of the mime type exists.

 * The second check is for the second part of the mime type. The last check is

 * for both types separated by an underscore. If neither are found then the file

 * 'attachment.php' is checked and returned.

 *

 * Some examples for the 'text/plain' mime type are 'text.php', 'plain.php', and

 * finally 'text_plain.php'.

 *

 * @since 2.0.0

 *

 * @return string

 */

function get_attachment_template() {

	global $posts;

	$type = explode('/', $posts[0]->post_mime_type);

	if ( $template = get_query_template($type[0]) )

		return $template;

	elseif ( $template = get_query_template($type[1]) )

		return $template;

	elseif ( $template = get_query_template("$type[0]_$type[1]") )

		return $template;

	else

		return get_query_template('attachment');

}



/**

 * Retrieve path of comment popup template in current or parent template.

 *

 * Checks for comment popup template in current template, if it exists or in the

 * parent template.

 *

 * @since 1.5.0

 * @uses apply_filters() Calls 'comments_popup_template' filter on path.

 *

 * @return string

 */

function get_comments_popup_template() {

	$template = get_query_template( 'comments_popup', array( 'comments-popup.php' ) );



	// Backward compat code will be removed in a future release

	if ('' == $template)

		$template = ABSPATH . WPINC . '/theme-compat/comments-popup.php';



	return $template;

}



/**

 * Retrieve the name of the highest priority template file that exists.

 *

 * Searches in the STYLESHEETPATH before TEMPLATEPATH so that themes which

 * inherit from a parent theme can just overload one file.

 *

 * @since 2.7.0

 *

 * @param string|array $template_names Template file(s) to search for, in order.

 * @param bool $load If true the template file will be loaded if it is found.

 * @param bool $require_once Whether to require_once or require. Default true. Has no effect if $load is false.

 * @return string The template filename if one is located.

 */

function locate_template($template_names, $load = false, $require_once = true ) {

	$located = '';

	foreach ( (array) $template_names as $template_name ) {

		if ( !$template_name )

			continue;

		if ( file_exists(STYLESHEETPATH . '/' . $template_name)) {

			$located = STYLESHEETPATH . '/' . $template_name;

			break;

		} else if ( file_exists(TEMPLATEPATH . '/' . $template_name) ) {

			$located = TEMPLATEPATH . '/' . $template_name;

			break;

		}

	}



	if ( $load && '' != $located )

		load_template( $located, $require_once );



	return $located;

}



/**

 * Require the template file with WordPress environment.

 *

 * The globals are set up for the template file to ensure that the WordPress

 * environment is available from within the function. The query variables are

 * also available.

 *

 * @since 1.5.0

 *

 * @param string $_template_file Path to template file.

 * @param bool $require_once Whether to require_once or require. Default true.

 */

function load_template( $_template_file, $require_once = true ) {

	global $posts, $post, $wp_did_header, $wp_did_template_redirect, $wp_query, $wp_rewrite, $wpdb, $wp_version, $wp, $id, $comment, $user_ID;



	if ( is_array( $wp_query->query_vars ) )

		extract( $wp_query->query_vars, EXTR_SKIP );



	if ( $require_once )

		require_once( $_template_file );

	else

		require( $_template_file );

}



/**

 * Display localized stylesheet link element.

 *

 * @since 2.1.0

 */

function locale_stylesheet() {

	$stylesheet = get_locale_stylesheet_uri();

	if ( empty($stylesheet) )

		return;

	echo '<link rel="stylesheet" href="' . $stylesheet . '" type="text/css" media="screen" />';

}



/**

 * Start preview theme output buffer.

 *

 * Will only preform task if the user has permissions and template and preview

 * query variables exist.

 *

 * @since 2.6.0

 */

function preview_theme() {

	if ( ! (isset($_GET['template']) && isset($_GET['preview'])) )

		return;



	if ( !current_user_can( 'switch_themes' ) )

		return;



	// Admin Thickbox requests

	if ( isset( $_GET['preview_iframe'] ) )

		show_admin_bar( false );



	$_GET['template'] = preg_replace('|[^a-z0-9_./-]|i', '', $_GET['template']);



	if ( validate_file($_GET['template']) )

		return;



	add_filter( 'template', '_preview_theme_template_filter' );



	if ( isset($_GET['stylesheet']) ) {

		$_GET['stylesheet'] = preg_replace('|[^a-z0-9_./-]|i', '', $_GET['stylesheet']);

		if ( validate_file($_GET['stylesheet']) )

			return;

		add_filter( 'stylesheet', '_preview_theme_stylesheet_filter' );

	}



	// Prevent theme mods to current theme being used on theme being previewed

	add_filter( 'pre_option_mods_' . get_current_theme(), '__return_empty_array' );



	ob_start( 'preview_theme_ob_filter' );

}

add_action('setup_theme', 'preview_theme');



/**

 * Private function to modify the current template when previewing a theme

 *

 * @since 2.9.0

 * @access private

 *

 * @return string

 */

function _preview_theme_template_filter() {

	return isset($_GET['template']) ? $_GET['template'] : '';

}



/**

 * Private function to modify the current stylesheet when previewing a theme

 *

 * @since 2.9.0

 * @access private

 *

 * @return string

 */

function _preview_theme_stylesheet_filter() {

	return isset($_GET['stylesheet']) ? $_GET['stylesheet'] : '';

}



/**

 * Callback function for ob_start() to capture all links in the theme.

 *

 * @since 2.6.0

 * @access private

 *

 * @param string $content

 * @return string

 */

function preview_theme_ob_filter( $content ) {

	return preg_replace_callback( "|(<a.*?href=([\"']))(.*?)([\"'].*?>)|", 'preview_theme_ob_filter_callback', $content );

}



/**

 * Manipulates preview theme links in order to control and maintain location.

 *

 * Callback function for preg_replace_callback() to accept and filter matches.

 *

 * @since 2.6.0

 * @access private

 *

 * @param array $matches

 * @return string

 */

function preview_theme_ob_filter_callback( $matches ) {

	if ( strpos($matches[4], 'onclick') !== false )

		$matches[4] = preg_replace('#onclick=([\'"]).*?(?<!\\\)\\1#i', '', $matches[4]); //Strip out any onclicks from rest of <a>. (?<!\\\) means to ignore the '" if its escaped by \  to prevent breaking mid-attribute.

	if (

		( false !== strpos($matches[3], '/wp-admin/') )

	||

		( false !== strpos( $matches[3], '://' ) && 0 !== strpos( $matches[3], home_url() ) )

	||

		( false !== strpos($matches[3], '/feed/') )

	||

		( false !== strpos($matches[3], '/trackback/') )

	)

		return $matches[1] . "#$matches[2] onclick=$matches[2]return false;" . $matches[4];



	$link = add_query_arg( array('preview' => 1, 'template' => $_GET['template'], 'stylesheet' => @$_GET['stylesheet'] ), $matches[3] );

	if ( 0 === strpos($link, 'preview=1') )

		$link = "?$link";

	return $matches[1] . esc_attr( $link ) . $matches[4];

}



/**

 * Switches current theme to new template and stylesheet names.

 *

 * @since 2.5.0

 * @uses do_action() Calls 'switch_theme' action on updated theme display name.

 *

 * @param string $template Template name

 * @param string $stylesheet Stylesheet name.

 */

function switch_theme($template, $stylesheet) {

	global $wp_theme_directories;



	update_option('template', $template);

	update_option('stylesheet', $stylesheet);

	if ( count($wp_theme_directories) > 1 ) {

		update_option('template_root', get_raw_theme_root($template, true));

		update_option('stylesheet_root', get_raw_theme_root($stylesheet, true));

	}

	delete_option('current_theme');

	$theme = get_current_theme();

	if ( is_admin() && false === get_option( "theme_mods_$stylesheet" ) ) {

		$default_theme_mods = (array) get_option( "mods_$theme" );

		add_option( "theme_mods_$stylesheet", $default_theme_mods );

	}

	do_action('switch_theme', $theme);

}



/**

 * Checks that current theme files 'index.php' and 'style.css' exists.

 *

 * Does not check the default theme, which is the fallback and should always exist.

 * Will switch theme to the fallback theme if current theme does not validate.

 * You can use the 'validate_current_theme' filter to return FALSE to

 * disable this functionality.

 *

 * @since 1.5.0

 * @see WP_DEFAULT_THEME

 *

 * @return bool

 */

function validate_current_theme() {

	// Don't validate during an install/upgrade.

	if ( defined('WP_INSTALLING') || !apply_filters( 'validate_current_theme', true ) )

		return true;



	if ( get_template() != WP_DEFAULT_THEME && !file_exists(get_template_directory() . '/index.php') ) {

		switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );

		return false;

	}



	if ( get_stylesheet() != WP_DEFAULT_THEME && !file_exists(get_template_directory() . '/style.css') ) {

		switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );

		return false;

	}



	if ( is_child_theme() && ! file_exists( get_stylesheet_directory() . '/style.css' ) ) {

		switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );

		return false;

	}



	return true;

}



/**

 * Retrieve all theme modifications.

 *

 * @since 3.1.0

 *

 * @return array Theme modifications.

 */

function get_theme_mods() {

	$theme_slug = get_option( 'stylesheet' );

	if ( false === ( $mods = get_option( "theme_mods_$theme_slug" ) ) ) {

		$theme_name = get_current_theme();

		$mods = get_option( "mods_$theme_name" ); // Deprecated location.

		if ( is_admin() && false !== $mods ) {

			update_option( "theme_mods_$theme_slug", $mods );

			delete_option( "mods_$theme_name" );

		}

	}

	return $mods;

}



/**

 * Retrieve theme modification value for the current theme.

 *

 * If the modification name does not exist, then the $default will be passed

 * through {@link http://php.net/sprintf sprintf()} PHP function with the first

 * string the template directory URI and the second string the stylesheet

 * directory URI.

 *

 * @since 2.1.0

 * @uses apply_filters() Calls 'theme_mod_$name' filter on the value.

 *

 * @param string $name Theme modification name.

 * @param bool|string $default

 * @return string

 */

function get_theme_mod( $name, $default = false ) {

	$mods = get_theme_mods();



	if ( isset( $mods[ $name ] ) )

		return apply_filters( "theme_mod_$name", $mods[ $name ] );



	return apply_filters( "theme_mod_$name", sprintf( $default, get_template_directory_uri(), get_stylesheet_directory_uri() ) );

}



/**

 * Update theme modification value for the current theme.

 *

 * @since 2.1.0

 *

 * @param string $name Theme modification name.

 * @param string $value theme modification value.

 */

function set_theme_mod( $name, $value ) {

	$mods = get_theme_mods();



	$mods[ $name ] = $value;



	$theme = get_option( 'stylesheet' );

	update_option( "theme_mods_$theme", $mods );

}



/**

 * Remove theme modification name from current theme list.

 *

 * If removing the name also removes all elements, then the entire option will

 * be removed.

 *

 * @since 2.1.0

 *

 * @param string $name Theme modification name.

 * @return null

 */

function remove_theme_mod( $name ) {

	$mods = get_theme_mods();



	if ( ! isset( $mods[ $name ] ) )

		return;



	unset( $mods[ $name ] );



	if ( empty( $mods ) )

		return remove_theme_mods();



	$theme = get_option( 'stylesheet' );

	update_option( "theme_mods_$theme", $mods );

}



/**

 * Remove theme modifications option for current theme.

 *

 * @since 2.1.0

 */

function remove_theme_mods() {

	delete_option( 'theme_mods_' . get_option( 'stylesheet' ) );

	delete_option( 'mods_' . get_current_theme() );

}



/**

 * Retrieve text color for custom header.

 *

 * @since 2.1.0

 * @uses HEADER_TEXTCOLOR

 *

 * @return string

 */

function get_header_textcolor() {

	$default = defined('HEADER_TEXTCOLOR') ? HEADER_TEXTCOLOR : '';



	return get_theme_mod('header_textcolor', $default);

}



/**

 * Display text color for custom header.

 *

 * @since 2.1.0

 */

function header_textcolor() {

	echo get_header_textcolor();

}



/**

 * Retrieve header image for custom header.

 *

 * @since 2.1.0

 * @uses HEADER_IMAGE

 *

 * @return string

 */

function get_header_image() {

	$default = defined( 'HEADER_IMAGE' ) ? HEADER_IMAGE : '';

	$url = get_theme_mod( 'header_image', $default );



	if ( 'remove-header' == $url )

		return false;



	if ( is_random_header_image() )

		$url = get_random_header_image();



	if ( is_ssl() )

		$url = str_replace( 'http://', 'https://', $url );

	else

		$url = str_replace( 'https://', 'http://', $url );



	return esc_url_raw( $url );

}



/**

 * Get random header image from registered images in theme.

 *

 * @since 3.2.0

 *

 * @return string Path to header image

 */

function get_random_header_image() {

	global $_wp_default_headers;



	$header_image_mod = get_theme_mod( 'header_image', '' );

	$headers = array();



	if ( 'random-uploaded-image' == $header_image_mod )

		$headers = get_uploaded_header_images();

	elseif ( ! empty( $_wp_default_headers ) ) {

		if ( 'random-default-image' == $header_image_mod ) {

			$headers = $_wp_default_headers;

		} else {

			$is_random = get_theme_support( 'custom-header' );

			if ( isset( $is_random[ 0 ] ) && !empty( $is_random[ 0 ][ 'random-default' ] ) )

				$headers = $_wp_default_headers;

		}

	}



	if ( empty( $headers ) )

		return '';



	$random_image = array_rand( $headers );

	$header_url = sprintf( $headers[$random_image]['url'], get_template_directory_uri(), get_stylesheet_directory_uri() );



	return $header_url;

}



/**

 * Check if random header image is in use.

 *

 * Always true if user expressly chooses the option in Appearance > Header.

 * Also true if theme has multiple header images registered, no specific header image

 * is chosen, and theme turns on random headers with add_theme_support().

 *

 * @since 3.2.0

 * @uses HEADER_IMAGE

 *

 * @param string $type The random pool to use. any|default|uploaded

 * @return boolean

 */

function is_random_header_image( $type = 'any' ) {

	$default = defined( 'HEADER_IMAGE' ) ? HEADER_IMAGE : '';

	$header_image_mod = get_theme_mod( 'header_image', $default );



	if ( 'any' == $type ) {

		if ( 'random-default-image' == $header_image_mod || 'random-uploaded-image' == $header_image_mod || ( '' != get_random_header_image() && empty( $header_image_mod ) ) )

			return true;

	} else {

		if ( "random-$type-image" == $header_image_mod )

			return true;

		elseif ( 'default' == $type && empty( $header_image_mod ) && '' != get_random_header_image() )

			return true;

	}



	return false;

}



/**

 * Display header image path.

 *

 * @since 2.1.0

 */

function header_image() {

	echo get_header_image();

}



/**

 * Get the header images uploaded for the current theme.

 *

 * @since 3.2.0

 *

 * @return array

 */

function get_uploaded_header_images() {

	$header_images = array();



	// @todo caching

	$headers = get_posts( array( 'post_type' => 'attachment', 'meta_key' => '_wp_attachment_is_custom_header', 'meta_value' => get_option('stylesheet'), 'orderby' => 'none', 'nopaging' => true ) );



	if ( empty( $headers ) )

		return array();



	foreach ( (array) $headers as $header ) {

		$url = esc_url_raw( $header->guid );

		$header = basename($url);

		$header_images[$header] = array();

		$header_images[$header]['url'] =  $url;

		$header_images[$header]['thumbnail_url'] =  $url;

		$header_images[$header]['uploaded'] = true;

	}



	return $header_images;

}



/**

 * Add callbacks for image header display.

 *

 * The parameter $header_callback callback will be required to display the

 * content for the 'wp_head' action. The parameter $admin_header_callback

 * callback will be added to Custom_Image_Header class and that will be added

 * to the 'admin_menu' action.

 *

 * @since 2.1.0

 * @uses Custom_Image_Header Sets up for $admin_header_callback for administration panel display.

 *

 * @param callback $header_callback Call on 'wp_head' action.

 * @param callback $admin_header_callback Call on custom header administration screen.

 * @param callback $admin_image_div_callback Output a custom header image div on the custom header administration screen. Optional.

 */

function add_custom_image_header( $header_callback, $admin_header_callback, $admin_image_div_callback = '' ) {

	if ( ! empty( $header_callback ) )

		add_action('wp_head', $header_callback);



	$support = array( 'callback' => $header_callback );

	$theme_support = get_theme_support( 'custom-header' );

	if ( ! empty( $theme_support ) && is_array( $theme_support[ 0 ] ) )

		$support = array_merge( $theme_support[ 0 ], $support );

	add_theme_support( 'custom-header',  $support );

	add_theme_support( 'custom-header-uploads' );



	if ( ! is_admin() )

		return;



	global $custom_image_header;



	require_once( ABSPATH . 'wp-admin/custom-header.php' );

	$custom_image_header = new Custom_Image_Header( $admin_header_callback, $admin_image_div_callback );

	add_action( 'admin_menu', array( &$custom_image_header, 'init' ) );

}



/**

 * Remove image header support.

 *

 * @since 3.1.0

 * @see add_custom_image_header()

 *

 * @return bool Whether support was removed.

 */

function remove_custom_image_header() {

	if ( ! current_theme_supports( 'custom-header' ) )

		return false;



	$callback = get_theme_support( 'custom-header' );

	remove_action( 'wp_head', $callback[0]['callback'] );

	_remove_theme_support( 'custom-header' );

	remove_theme_support( 'custom-header-uploads' );



	if ( is_admin() ) {

		remove_action( 'admin_menu', array( &$GLOBALS['custom_image_header'], 'init' ) );

		unset( $GLOBALS['custom_image_header'] );

	}



	return true;

}



/**

 * Register a selection of default headers to be displayed by the custom header admin UI.

 *

 * @since 3.0.0

 *

 * @param array $headers Array of headers keyed by a string id. The ids point to arrays containing 'url', 'thumbnail_url', and 'description' keys.

 */

function register_default_headers( $headers ) {

	global $_wp_default_headers;



	$_wp_default_headers = array_merge( (array) $_wp_default_headers, (array) $headers );

}



/**

 * Unregister default headers.

 *

 * This function must be called after register_default_headers() has already added the

 * header you want to remove.

 *

 * @see register_default_headers()

 * @since 3.0.0

 *

 * @param string|array $header The header string id (key of array) to remove, or an array thereof.

 * @return True on success, false on failure.

 */

function unregister_default_headers( $header ) {

	global $_wp_default_headers;

	if ( is_array( $header ) ) {

		array_map( 'unregister_default_headers', $header );

	} elseif ( isset( $_wp_default_headers[ $header ] ) ) {

		unset( $_wp_default_headers[ $header ] );

		return true;

	} else {

		return false;

	}

}



/**

 * Retrieve background image for custom background.

 *

 * @since 3.0.0

 *

 * @return string

 */

function get_background_image() {

	$default = defined('BACKGROUND_IMAGE') ? BACKGROUND_IMAGE : '';



	retu…