/wp-includes/post.php

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<?php
/**
 * Post functions and post utility function.
 *
 * Warning: The inline documentation for the functions contained
 * in this file might be inaccurate, so the documentation is not
 * authoritative at the moment.
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5
 */

/**
 * Retrieve attached file path based on attachment ID.
 *
 * You can optionally send it through the 'get_attached_file' filter, but by
 * default it will just return the file path unfiltered.
 *
 * The function works by getting the single post meta name, named
 * '_wp_attached_file' and returning it. This is a convenience function to
 * prevent looking up the meta name and provide a mechanism for sending the
 * attached filename through a filter.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.0
 * @uses apply_filters() Calls 'get_attached_file' on file path and attachment ID
 *
 * @param int $attachment_id Attachment ID
 * @param bool $unfiltered Whether to apply filters or not
 * @return string The file path to the attached file.
 */
function get_attached_file( $attachment_id, $unfiltered = false ) {
	$file = get_post_meta( $attachment_id, '_wp_attached_file', true );
	if ( $unfiltered )
		return $file;
	return apply_filters( 'get_attached_file', $file, $attachment_id );
}

/**
 * Update attachment file path based on attachment ID.
 *
 * Used to update the file path of the attachment, which uses post meta name
 * '_wp_attached_file' to store the path of the attachment.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.1
 * @uses apply_filters() Calls 'update_attached_file' on file path and attachment ID
 *
 * @param int $attachment_id Attachment ID
 * @param string $file File path for the attachment
 * @return bool False on failure, true on success.
 */
function update_attached_file( $attachment_id, $file ) {
	if ( !get_post( $attachment_id ) )
		return false;

	$file = apply_filters( 'update_attached_file', $file, $attachment_id );

	return update_post_meta( $attachment_id, '_wp_attached_file', $file );
}

/**
 * Retrieve all children of the post parent ID.
 *
 * Normally, without any enhancements, the children would apply to pages. In the
 * context of the inner workings of WordPress, pages, posts, and attachments
 * share the same table, so therefore the functionality could apply to any one
 * of them. It is then noted that while this function does not work on posts, it
 * does not mean that it won't work on posts. It is recommended that you know
 * what context you wish to retrieve the children of.
 *
 * Attachments may also be made the child of a post, so if that is an accurate
 * statement (which needs to be verified), it would then be possible to get
 * all of the attachments for a post. Attachments have since changed since
 * version 2.5, so this is most likely unaccurate, but serves generally as an
 * example of what is possible.
 *
 * The arguments listed as defaults are for this function and also of the
 * get_posts() function. The arguments are combined with the get_children
 * defaults and are then passed to the get_posts() function, which accepts
 * additional arguments. You can replace the defaults in this function, listed
 * below and the additional arguments listed in the get_posts() function.
 *
 * The 'post_parent' is the most important argument and important attention
 * needs to be paid to the $args parameter. If you pass either an object or an
 * integer (number), then just the 'post_parent' is grabbed and everything else
 * is lost. If you don't specify any arguments, then it is assumed that you are
 * in The Loop and the post parent will be grabbed for from the current post.
 *
 * The 'post_parent' argument is the ID to get the children. The 'numberposts'
 * is the amount of posts to retrieve that has a default of '-1', which is
 * used to get all of the posts. Giving a number higher than 0 will only
 * retrieve that amount of posts.
 *
 * The 'post_type' and 'post_status' arguments can be used to choose what
 * criteria of posts to retrieve. The 'post_type' can be anything, but WordPress
 * post types are 'post', 'pages', and 'attachments'. The 'post_status'
 * argument will accept any post status within the write administration panels.
 *
 * @see get_posts() Has additional arguments that can be replaced.
 * @internal Claims made in the long description might be inaccurate.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.0
 *
 * @param mixed $args Optional. User defined arguments for replacing the defaults.
 * @param string $output Optional. Constant for return type, either OBJECT (default), ARRAY_A, ARRAY_N.
 * @return array|bool False on failure and the type will be determined by $output parameter.
 */
function &get_children($args = '', $output = OBJECT) {
	if ( empty( $args ) ) {
		if ( isset( $GLOBALS['post'] ) ) {
			$args = array('post_parent' => (int) $GLOBALS['post']->post_parent );
		} else {
			return false;
		}
	} elseif ( is_object( $args ) ) {
		$args = array('post_parent' => (int) $args->post_parent );
	} elseif ( is_numeric( $args ) ) {
		$args = array('post_parent' => (int) $args);
	}

	$defaults = array(
		'numberposts' => -1, 'post_type' => '',
		'post_status' => '', 'post_parent' => 0
	);

	$r = wp_parse_args( $args, $defaults );

	$children = get_posts( $r );
	if ( !$children )
		return false;

	update_post_cache($children);

	foreach ( $children as $key => $child )
		$kids[$child->ID] =& $children[$key];

	if ( $output == OBJECT ) {
		return $kids;
	} elseif ( $output == ARRAY_A ) {
		foreach ( $kids as $kid )
			$weeuns[$kid->ID] = get_object_vars($kids[$kid->ID]);
		return $weeuns;
	} elseif ( $output == ARRAY_N ) {
		foreach ( $kids as $kid )
			$babes[$kid->ID] = array_values(get_object_vars($kids[$kid->ID]));
		return $babes;
	} else {
		return $kids;
	}
}

/**
 * get_extended() - Get extended entry info (<!--more-->)
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.0.0
 *
 * @param string $post {@internal Missing Description}}
 * @return array {@internal Missing Description}}
 */
function get_extended($post) {
	//Match the new style more links
	if ( preg_match('/<!--more(.*?)?-->/', $post, $matches) ) {
		list($main, $extended) = explode($matches[0], $post, 2);
	} else {
		$main = $post;
		$extended = '';
	}

	// Strip leading and trailing whitespace
	$main = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $main);
	$extended = preg_replace('/^[\s]*(.*)[\s]*$/', '\\1', $extended);

	return array('main' => $main, 'extended' => $extended);
}

/**
 * get_post() - Retrieves post data given a post ID or post object.
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5.1
 * @uses $wpdb
 * @link http://codex.wordpress.org/Function_Reference/get_post
 *
 * @param int|object &$post post ID or post object
 * @param string $output {@internal Missing Description}}
 * @param string $filter {@internal Missing Description}}
 * @return mixed {@internal Missing Description}}
 */
function &get_post(&$post, $output = OBJECT, $filter = 'raw') {
	global $wpdb;
	$null = null;

	if ( empty($post) ) {
		if ( isset($GLOBALS['post']) )
			$_post = & $GLOBALS['post'];
		else
			return $null;
	} elseif ( is_object($post) ) {
		_get_post_ancestors($post);
		wp_cache_add($post->ID, $post, 'posts');
		$_post = &$post;
	} else {
		$post = (int) $post;
		if ( ! $_post = wp_cache_get($post, 'posts') ) {
			$_post = & $wpdb->get_row($wpdb->prepare("SELECT * FROM $wpdb->posts WHERE ID = %d LIMIT 1", $post));
			if ( ! $_post )
				return $null;
			_get_post_ancestors($_post);
			wp_cache_add($_post->ID, $_post, 'posts');
		}
	}

	$_post = sanitize_post($_post, $filter);

	if ( $output == OBJECT ) {
		return $_post;
	} elseif ( $output == ARRAY_A ) {
		$__post = get_object_vars($_post);
		return $__post;
	} elseif ( $output == ARRAY_N ) {
		$__post = array_values(get_object_vars($_post));
		return $__post;
	} else {
		return $_post;
	}
}

/**
 * Retrieve ancestors of a post.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.5
 *
 * @param int|object $post Post ID or post object
 * @return array Ancestor IDs or empty array if none are found.
 */
function get_post_ancestors($post) {
	$post = get_post($post);

	if ( !empty($post->ancestors) )
		return $post->ancestors;

	return array();
}

/**
 * Retrieve data from a post field based on Post ID.
 *
 * Examples of the post field will be, 'post_type', 'post_status', 'content',
 * etc and based off of the post object property or key names.
 *
 * The context values are based off of the taxonomy filter functions and
 * supported values are found within those functions.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.3
 * @uses sanitize_post_field() See for possible $context values.
 *
 * @param string $field Post field name
 * @param id $post Post ID
 * @param string $context Optional. How to filter the field. Default is display.
 * @return WP_Error|string Value in post field or WP_Error on failure
 */
function get_post_field( $field, $post, $context = 'display' ) {
	$post = (int) $post;
	$post = get_post( $post );

	if ( is_wp_error($post) )
		return $post;

	if ( !is_object($post) )
		return '';

	if ( !isset($post->$field) )
		return '';

	return sanitize_post_field($field, $post->$field, $post->ID, $context);
}

/**
 * Retrieve the mime type of an attachment based on the ID.
 *
 * This function can be used with any post type, but it makes more sense with
 * attachments.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.0
 *
 * @param int $ID Optional. Post ID.
 * @return bool|string False on failure or returns the mime type
 */
function get_post_mime_type($ID = '') {
	$post = & get_post($ID);

	if ( is_object($post) )
		return $post->post_mime_type;

	return false;
}

/**
 * Retrieve the post status based on the Post ID.
 *
 * If the post ID is of an attachment, then the parent post status will be given
 * instead.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.0
 *
 * @param int $ID Post ID
 * @return string|bool Post status or false on failure.
 */
function get_post_status($ID = '') {
	$post = get_post($ID);

	if ( is_object($post) ) {
		if ( ('attachment' == $post->post_type) && $post->post_parent && ($post->ID != $post->post_parent) )
			return get_post_status($post->post_parent);
		else
			return $post->post_status;
	}

	return false;
}

/**
 * Retrieve all of the WordPress supported post statuses.
 *
 * Posts have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.5
 *
 * @return array List of post statuses.
 */
function get_post_statuses( ) {
	$status = array(
		'draft'			=> __('Draft'),
		'pending'		=> __('Pending Review'),
		'private'		=> __('Private'),
		'publish'		=> __('Published')
	);

	return $status;
}

/**
 * Retrieve all of the WordPress support page statuses.
 *
 * Pages have a limited set of valid status values, this provides the
 * post_status values and descriptions.
 *
 * @package WordPress
 * @subpackage Page
 * @since 2.5
 *
 * @return array List of page statuses.
 */
function get_page_statuses( ) {
	$status = array(
		'draft'			=> __('Draft'),
		'private'		=> __('Private'),
		'publish'		=> __('Published')
	);

	return $status;
}

/**
 * get_post_type() - Returns post type
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.1
 *
 * @uses $wpdb
 * @uses $posts {@internal Missing Description}}
 *
 * @param mixed $post post object or post ID
 * @return mixed post type or false
 */
function get_post_type($post = false) {
	global $posts;

	if ( false === $post )
		$post = $posts[0];
	elseif ( (int) $post )
		$post = get_post($post, OBJECT);

	if ( is_object($post) )
		return $post->post_type;

	return false;
}

/**
 * set_post_type() - Set post type
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.5
 *
 * @uses $wpdb
 * @uses $posts {@internal Missing Description}}
 *
 * @param mixed $post_id post ID
 * @param mixed post type
 * @return bool {@internal Missing Description}}
 */
function set_post_type( $post_id = 0, $post_type = 'post' ) {
	global $wpdb;

	$post_type = sanitize_post_field('post_type', $post_type, $post_id, 'db');
	$return = $wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET post_type = %s WHERE ID = %d", $post_type, $post_id) );

	if ( 'page' == $post_type )
		clean_page_cache($post_id);
	else
		clean_post_cache($post_id);

	return $return;
}

/**
 * get_posts() - Returns a number of posts
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.2
 * @uses $wpdb
 * @link http://codex.wordpress.org/Template_Tags/get_posts
 *
 * @param array $args {@internal Missing Description}}
 * @return array {@internal Missing Description}}
 */
function get_posts($args = null) {
	$defaults = array(
		'numberposts' => 5, 'offset' => 0,
		'category' => 0, 'orderby' => 'post_date',
		'order' => 'DESC', 'include' => '',
		'exclude' => '', 'meta_key' => '',
		'meta_value' =>'', 'post_type' => 'post',
		'post_parent' => 0
	);

	$r = wp_parse_args( $args, $defaults );
	if ( empty( $r['post_status'] ) )
		$r['post_status'] = ( 'attachment' == $r['post_type'] ) ? 'inherit' : 'publish';
	if ( ! empty($r['numberposts']) )
		$r['posts_per_page'] = $r['numberposts'];
	if ( ! empty($r['category']) )
		$r['cat'] = $r['category'];
	if ( ! empty($r['include']) ) {
		$incposts = preg_split('/[\s,]+/',$r['include']);
		$r['posts_per_page'] = count($incposts);  // only the number of posts included
		$r['post__in'] = $incposts;
	} elseif ( ! empty($r['exclude']) )
		$r['post__not_in'] = preg_split('/[\s,]+/',$r['exclude']);

	$get_posts = new WP_Query;
	return $get_posts->query($r);

}

//
// Post meta functions
//

/**
 * add_post_meta() - adds metadata for post
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5
 * @uses $wpdb
 * @link http://codex.wordpress.org/Function_Reference/add_post_meta
 *
 * @param int $post_id post ID
 * @param string $key {@internal Missing Description}}
 * @param mixed $value {@internal Missing Description}}
 * @param bool $unique whether to check for a value with the same key
 * @return bool {@internal Missing Description}}
 */
function add_post_meta($post_id, $meta_key, $meta_value, $unique = false) {
	global $wpdb;

	// make sure meta is added to the post, not a revision
	if ( $the_post = wp_is_post_revision($post_id) )
		$post_id = $the_post;

	// expected_slashed ($meta_key)
	$meta_key = stripslashes($meta_key);

	if ( $unique && $wpdb->get_var( $wpdb->prepare( "SELECT meta_key FROM $wpdb->postmeta WHERE meta_key = %s AND post_id = %d", $meta_key, $post_id ) ) )
		return false;

	$meta_value = maybe_serialize($meta_value);

	$wpdb->insert( $wpdb->postmeta, compact( 'post_id', 'meta_key', 'meta_value' ) );

	wp_cache_delete($post_id, 'post_meta');

	return true;
}

/**
 * delete_post_meta() - delete post metadata
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5
 * @uses $wpdb
 * @link http://codex.wordpress.org/Function_Reference/delete_post_meta
 *
 * @param int $post_id post ID
 * @param string $key {@internal Missing Description}}
 * @param mixed $value {@internal Missing Description}}
 * @return bool {@internal Missing Description}}
 */
function delete_post_meta($post_id, $key, $value = '') {
	global $wpdb;

	$post_id = absint( $post_id );

	// expected_slashed ($key, $value)
	$key = stripslashes( $key );
	$value = stripslashes( $value );

	if ( empty( $value ) )
		$meta_id = $wpdb->get_var( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = %s", $post_id, $key ) );
	else
		$meta_id = $wpdb->get_var( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = %s AND meta_value = %s", $post_id, $key, $value ) );

	if ( !$meta_id )
		return false;

	if ( empty( $value ) )
		$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = %s", $post_id, $key ) );
	else
		$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->postmeta WHERE post_id = %d AND meta_key = %s AND meta_value = %s", $post_id, $key, $value ) );

	wp_cache_delete($post_id, 'post_meta');

	return true;
}

/**
 * get_post_meta() - Get a post meta field
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5
 * @uses $wpdb
 * @link http://codex.wordpress.org/Function_Reference/get_post_meta
 *
 * @param int $post_id post ID
 * @param string $key The meta key to retrieve
 * @param bool $single Whether to return a single value
 * @return mixed {@internal Missing Description}}
 */
function get_post_meta($post_id, $key, $single = false) {
	$post_id = (int) $post_id;

	$meta_cache = wp_cache_get($post_id, 'post_meta');

	if ( isset($meta_cache[$key]) ) {
		if ( $single ) {
			return maybe_unserialize( $meta_cache[$key][0] );
		} else {
			return maybe_unserialize( $meta_cache[$key] );
		}
	}

	if ( !$meta_cache ) {
		update_postmeta_cache($post_id);
		$meta_cache = wp_cache_get($post_id, 'post_meta');
	}

	if ( $single ) {
		if ( isset($meta_cache[$key][0]) )
			return maybe_unserialize($meta_cache[$key][0]);
		else
			return '';
	} else {
		return maybe_unserialize($meta_cache[$key]);
	}
}

/**
 * update_post_meta() - Update a post meta field
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5
 * @uses $wpdb
 * @link http://codex.wordpress.org/Function_Reference/update_post_meta
 *
 * @param int $post_id post ID
 * @param string $key {@internal Missing Description}}
 * @param mixed $value {@internal Missing Description}}
 * @param mixed $prev_value previous value (for differentiating between meta fields with the same key and post ID)
 * @return bool {@internal Missing Description}}
 */
function update_post_meta($post_id, $meta_key, $meta_value, $prev_value = '') {
	global $wpdb;

	// expected_slashed ($meta_key)
	$meta_key = stripslashes($meta_key);

	if ( ! $wpdb->get_var( $wpdb->prepare( "SELECT meta_key FROM $wpdb->postmeta WHERE meta_key = %s AND post_id = %d", $meta_key, $post_id ) ) ) {
		return add_post_meta($post_id, $meta_key, $meta_value);
	}

	$meta_value = maybe_serialize($meta_value);

	$data  = compact( 'meta_value' );
	$where = compact( 'meta_key', 'post_id' );

	if ( !empty( $prev_value ) ) {
		$prev_value = maybe_serialize($prev_value);
		$where['meta_value'] = $prev_value;
	}

	$wpdb->update( $wpdb->postmeta, $data, $where );
	wp_cache_delete($post_id, 'post_meta');
	return true;
}

/**
 * delete_post_meta_by_key() - Delete everything from post meta matching $post_meta_key
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.3
 * @uses $wpdb
 *
 * @param string $post_meta_key What to search for when deleting
 * @return bool Whether the post meta key was deleted from the database
 */
function delete_post_meta_by_key($post_meta_key) {
	global $wpdb;
	if ( $wpdb->query($wpdb->prepare("DELETE FROM $wpdb->postmeta WHERE meta_key = %s", $post_meta_key)) ) {
		/** @todo Get post_ids and delete cache */
		// wp_cache_delete($post_id, 'post_meta');
		return true;
	}
	return false;
}

/**
 * get_post_custom() - Retrieve post custom fields
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.2
 * @link http://codex.wordpress.org/Function_Reference/get_post_custom
 *
 * @uses $id
 * @uses $wpdb
 *
 * @param int $post_id post ID
 * @return array {@internal Missing Description}}
 */
function get_post_custom($post_id = 0) {
	global $id;

	if ( !$post_id )
		$post_id = (int) $id;

	$post_id = (int) $post_id;

	if ( ! wp_cache_get($post_id, 'post_meta') )
		update_postmeta_cache($post_id);

	return wp_cache_get($post_id, 'post_meta');
}

/**
 * get_post_custom_keys() - Retrieve post custom field names
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.2
 * @link http://codex.wordpress.org/Function_Reference/get_post_custom_keys
 *
 * @param int $post_id post ID
 * @return array|null Either array of the keys, or null if keys would not be retrieved
 */
function get_post_custom_keys( $post_id = 0 ) {
	$custom = get_post_custom( $post_id );

	if ( !is_array($custom) )
		return;

	if ( $keys = array_keys($custom) )
		return $keys;
}

/**
 * get_post_custom_values() - Retrieve values for a custom post field
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.2
 * @link http://codex.wordpress.org/Function_Reference/get_post_custom_values
 *
 * @param string $key field name
 * @param int $post_id post ID
 * @return mixed {@internal Missing Description}}
 */
function get_post_custom_values( $key = '', $post_id = 0 ) {
	$custom = get_post_custom($post_id);

	return $custom[$key];
}

/**
 * sanitize_post() - Sanitize every post field
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.3
 *
 * @param object|array $post The Post Object or Array
 * @param string $context How to sanitize post fields
 * @return object|array The now sanitized Post Object or Array (will be the same type as $post)
 */
function sanitize_post($post, $context = 'display') {
	if ( 'raw' == $context )
		return $post;
	if ( is_object($post) ) {
		foreach ( array_keys(get_object_vars($post)) as $field )
			$post->$field = sanitize_post_field($field, $post->$field, $post->ID, $context);
	} else {
		foreach ( array_keys($post) as $field )
			$post[$field] = sanitize_post_field($field, $post[$field], $post['ID'], $context);
	}
	return $post;
}

/**
 * sanitize_post_field() - Sanitize post field based on context
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.3
 *
 * @param string $field The Post Object field name
 * @param string $value The Post Object value
 * @param int $postid Post ID
 * @param string $context How to sanitize post fields
 * @return string Sanitized value
 */
function sanitize_post_field($field, $value, $post_id, $context) {
	$int_fields = array('ID', 'post_parent', 'menu_order');
	if ( in_array($field, $int_fields) )
		$value = (int) $value;

	if ( 'raw' == $context )
		return $value;

	$prefixed = false;
	if ( false !== strpos($field, 'post_') ) {
		$prefixed = true;
		$field_no_prefix = str_replace('post_', '', $field);
	}

	if ( 'edit' == $context ) {
		$format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password');

		if ( $prefixed ) {
			$value = apply_filters("edit_$field", $value, $post_id);
			// Old school
			$value = apply_filters("${field_no_prefix}_edit_pre", $value, $post_id);
		} else {
			$value = apply_filters("edit_post_$field", $value, $post_id);
		}

		if ( in_array($field, $format_to_edit) ) {
			if ( 'post_content' == $field )
				$value = format_to_edit($value, user_can_richedit());
			else
				$value = format_to_edit($value);
		} else {
			$value = attribute_escape($value);
		}
	} else if ( 'db' == $context ) {
		if ( $prefixed ) {
			$value = apply_filters("pre_$field", $value);
			$value = apply_filters("${field_no_prefix}_save_pre", $value);
		} else {
			$value = apply_filters("pre_post_$field", $value);
			$value = apply_filters("${field}_pre", $value);
		}
	} else {
		// Use display filters by default.
		if ( $prefixed )
			$value = apply_filters($field, $value, $post_id, $context);
		else
			$value = apply_filters("post_$field", $value, $post_id, $context);
	}

	if ( 'attribute' == $context )
		$value = attribute_escape($value);
	else if ( 'js' == $context )
		$value = js_escape($value);

	return $value;
}

/**
 * Count number of posts of a post type and is user has permissions to view.
 *
 * This function provides an efficient method of finding the amount of post's
 * type a blog has. Another method is to count the amount of items in
 * get_posts(), but that method has a lot of overhead with doing so. Therefore,
 * when developing for 2.5+, use this function instead.
 *
 * The $perm parameter checks for 'readable' value and if the user can read
 * private posts, it will display that for the user that is signed in.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.5
 * @link http://codex.wordpress.org/Template_Tags/wp_count_posts
 *
 * @param string $type Optional. Post type to retrieve count
 * @param string $perm Optional. 'readable' or empty.
 * @return object Number of posts for each status
 */
function wp_count_posts( $type = 'post', $perm = '' ) {
	global $wpdb;

	$user = wp_get_current_user();

	$cache_key = $type;

	$query = "SELECT post_status, COUNT( * ) AS num_posts FROM {$wpdb->posts} WHERE post_type = %s";
	if ( 'readable' == $perm && is_user_logged_in() ) {
		if ( !current_user_can("read_private_{$type}s") ) {
			$cache_key .= '_' . $perm . '_' . $user->ID;
			$query .= " AND (post_status != 'private' OR ( post_author = '$user->ID' AND post_status = 'private' ))";
		}
	}
	$query .= ' GROUP BY post_status';

	$count = wp_cache_get($cache_key, 'counts');
	if ( false !== $count )
		return $count;

	$count = $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );

	$stats = array( );
	foreach( (array) $count as $row_num => $row ) {
		$stats[$row['post_status']] = $row['num_posts'];
	}

	$stats = (object) $stats;
	wp_cache_set($cache_key, $stats, 'counts');

	return $stats;
}


/**
 * wp_count_attachments() - Count number of attachments
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.5
 *
 * @param string|array $post_mime_type Array or comma-separated list of MIME patterns
 * @return array Number of posts for each post_mime_type
 */

function wp_count_attachments( $mime_type = '' ) {
	global $wpdb;

	$and = wp_post_mime_type_where( $mime_type );
	$count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' $and GROUP BY post_mime_type", ARRAY_A );

	$stats = array( );
	foreach( (array) $count as $row ) {
		$stats[$row['post_mime_type']] = $row['num_posts'];
	}

	return (object) $stats;
}

/**
 * wp_match_mime_type() - Check a MIME-Type against a list
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.5
 *
 * @param string|array $wildcard_mime_types e.g. audio/mpeg or image (same as image/*) or flash (same as *flash*)
 * @param string|array $real_mime_types post_mime_type values
 * @return array array(wildcard=>array(real types))
 */
function wp_match_mime_types($wildcard_mime_types, $real_mime_types) {
	$matches = array();
	if ( is_string($wildcard_mime_types) )
		$wildcard_mime_types = array_map('trim', explode(',', $wildcard_mime_types));
	if ( is_string($real_mime_types) )
		$real_mime_types = array_map('trim', explode(',', $real_mime_types));
	$wild = '[-._a-z0-9]*';
	foreach ( (array) $wildcard_mime_types as $type ) {
		$type = str_replace('*', $wild, $type);
		$patternses[1][$type] = "^$type$";
		if ( false === strpos($type, '/') ) {
			$patternses[2][$type] = "^$type/";
			$patternses[3][$type] = $type;
		}
	}
	asort($patternses);
	foreach ( $patternses as $patterns )
		foreach ( $patterns as $type => $pattern )
			foreach ( (array) $real_mime_types as $real )
				if ( preg_match("#$pattern#", $real) && ( empty($matches[$type]) || false === array_search($real, $matches[$type]) ) )
					$matches[$type][] = $real;
	return $matches;
}

/**
 * wp_get_post_mime_type_where() - Convert MIME types into SQL
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.5
 *
 * @param string|array $mime_types MIME types
 * @return string SQL AND clause
 */
function wp_post_mime_type_where($post_mime_types) {
	$where = '';
	$wildcards = array('', '%', '%/%');
	if ( is_string($post_mime_types) )
		$post_mime_types = array_map('trim', explode(',', $post_mime_types));
	foreach ( (array) $post_mime_types as $mime_type ) {
		$mime_type = preg_replace('/\s/', '', $mime_type);
		$slashpos = strpos($mime_type, '/');
		if ( false !== $slashpos ) {
			$mime_group = preg_replace('/[^-*.a-zA-Z0-9]/', '', substr($mime_type, 0, $slashpos));
			$mime_subgroup = preg_replace('/[^-*.a-zA-Z0-9]/', '', substr($mime_type, $slashpos + 1));
			if ( empty($mime_subgroup) )
				$mime_subgroup = '*';
			else
				$mime_subgroup = str_replace('/', '', $mime_subgroup);
			$mime_pattern = "$mime_group/$mime_subgroup";
		} else {
			$mime_pattern = preg_replace('/[^-*.a-zA-Z0-9]/', '', $mime_type);
			if ( false === strpos($mime_pattern, '*') )
				$mime_pattern .= '/*';
		}

		$mime_pattern = preg_replace('/\*+/', '%', $mime_pattern);

		if ( in_array( $mime_type, $wildcards ) )
			return '';

		if ( false !== strpos($mime_pattern, '%') )
			$wheres[] = "post_mime_type LIKE '$mime_pattern'";
		else
			$wheres[] = "post_mime_type = '$mime_pattern'";
	}
	if ( !empty($wheres) )
		$where = ' AND (' . join(' OR ', $wheres) . ') ';
	return $where;
}

/**
 * wp_delete_post() - Deletes a Post
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.0.0
 *
 * @param int $postid post ID
 * @return mixed {@internal Missing Description}}
 */
function wp_delete_post($postid = 0) {
	global $wpdb, $wp_rewrite;

	if ( !$post = $wpdb->get_row($wpdb->prepare("SELECT * FROM $wpdb->posts WHERE ID = %d", $postid)) )
		return $post;

	if ( 'attachment' == $post->post_type )
		return wp_delete_attachment($postid);

	do_action('delete_post', $postid);

	/** @todo delete for pluggable post taxonomies too */
	wp_delete_object_term_relationships($postid, array('category', 'post_tag'));

	$parent_data = array( 'post_parent' => $post->post_parent );
	$parent_where = array( 'post_parent' => $postid );

	if ( 'page' == $post->post_type) {
	 	// if the page is defined in option page_on_front or post_for_posts,
		// adjust the corresponding options
		if ( get_option('page_on_front') == $postid ) {
			update_option('show_on_front', 'posts');
			delete_option('page_on_front');
		}
		if ( get_option('page_for_posts') == $postid ) {
			delete_option('page_for_posts');
		}

		// Point children of this page to its parent, also clean the cache of affected children
		$children_query = $wpdb->prepare("SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type='page'", $postid);
		$children = $wpdb->get_results($children_query);

		$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'page' ) );
	}

	// Do raw query.  wp_get_post_revisions() is filtered
	$revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
	// Use wp_delete_post (via wp_delete_post_revision) again.  Ensures any meta/misplaced data gets cleaned up.
	foreach ( $revision_ids as $revision_id )
		wp_delete_post_revision( $revision_id );

	// Point all attachments to this post up one level
	$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) );

	$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->posts WHERE ID = %d", $postid ));

	$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->comments WHERE comment_post_ID = %d", $postid ));

	$wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->postmeta WHERE post_id = %d", $postid ));

	if ( 'page' == $post->post_type ) {
		clean_page_cache($postid);

		foreach ( (array) $children as $child )
			clean_page_cache($child->ID);

		$wp_rewrite->flush_rules();
	} else {
		clean_post_cache($postid);
	}

	do_action('deleted_post', $postid);

	return $post;
}

/**
 * wp_get_post_categories() - Retrieve the list of categories for a post
 *
 * Compatibility layer for themes and plugins. Also an easy layer of abstraction
 * away from the complexity of the taxonomy layer.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.1
 *
 * @uses wp_get_object_terms() Retrieves the categories. Args details can be found here
 *
 * @param int $post_id Optional. The Post ID
 * @param array $args Optional. Overwrite the defaults
 * @return array {@internal Missing Description}}
 */
function wp_get_post_categories( $post_id = 0, $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array('fields' => 'ids');
	$args = wp_parse_args( $args, $defaults );

	$cats = wp_get_object_terms($post_id, 'category', $args);
	return $cats;
}

/**
 * wp_get_post_tags() - Retrieve the post tags
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.3
 *
 * @uses wp_get_object_terms() Gets the tags for returning. Args can be found here
 *
 * @param int $post_id Optional. The Post ID
 * @param array $args Optional. Overwrite the defaults
 * @return mixed The tags the post has currently
 */
function wp_get_post_tags( $post_id = 0, $args = array() ) {
	$post_id = (int) $post_id;

	$defaults = array('fields' => 'all');
	$args = wp_parse_args( $args, $defaults );

	$tags = wp_get_object_terms($post_id, 'post_tag', $args);

	return $tags;
}

/**
 * wp_get_recent_posts() - Get the $num most recent posts
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.0.0
 *
 * @param int $num number of posts to get
 * @return array {@internal Missing Description}}
 */
function wp_get_recent_posts($num = 10) {
	global $wpdb;

	// Set the limit clause, if we got a limit
	$num = (int) $num;
	if ($num) {
		$limit = "LIMIT $num";
	}

	$sql = "SELECT * FROM $wpdb->posts WHERE post_type = 'post' ORDER BY post_date DESC $limit";
	$result = $wpdb->get_results($sql,ARRAY_A);

	return $result?$result:array();
}

/**
 * wp_get_single_post() - Get one post
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.0.0
 * @uses $wpdb
 *
 * @param int $postid post ID
 * @param string $mode How to return result, either OBJECT, ARRAY_N, or ARRAY_A
 * @return object|array Post object or array holding post contents and information
 */
function wp_get_single_post($postid = 0, $mode = OBJECT) {
	$postid = (int) $postid;

	$post = get_post($postid, $mode);

	// Set categories and tags
	if($mode == OBJECT) {
		$post->post_category = wp_get_post_categories($postid);
		$post->tags_input = wp_get_post_tags($postid, array('fields' => 'names'));
	}
	else {
		$post['post_category'] = wp_get_post_categories($postid);
		$post['tags_input'] = wp_get_post_tags($postid, array('fields' => 'names'));
	}

	return $post;
}

/**
 * wp_insert_post() - Insert a post
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.0.0
 *
 * @uses $wpdb
 * @uses $wp_rewrite
 * @uses $user_ID
 * @uses $allowedtags
 *
 * @param array $postarr post contents
 * @return int post ID or 0 on error
 */
function wp_insert_post($postarr = array(), $wp_error = false) {
	global $wpdb, $wp_rewrite, $user_ID;

	$defaults = array('post_status' => 'draft', 'post_type' => 'post', 'post_author' => $user_ID,
		'ping_status' => get_option('default_ping_status'), 'post_parent' => 0,
		'menu_order' => 0, 'to_ping' =>  '', 'pinged' => '', 'post_password' => '',
		'guid' => '', 'post_content_filtered' => '', 'post_excerpt' => '');

	$postarr = wp_parse_args($postarr, $defaults);
	$postarr = sanitize_post($postarr, 'db');

	// export array as variables
	extract($postarr, EXTR_SKIP);

	// Are we updating or creating?
	$update = false;
	if ( !empty($ID) ) {
		$update = true;
		$previous_status = get_post_field('post_status', $ID);
	} else {
		$previous_status = 'new';
	}

	if ( ('' == $post_content) && ('' == $post_title) && ('' == $post_excerpt) ) {
		if ( $wp_error )
			return new WP_Error('empty_content', __('Content, title, and excerpt are empty.'));
		else
			return 0;
	}

	// Make sure we set a valid category
	if (0 == count($post_category) || !is_array($post_category)) {
		$post_category = array(get_option('default_category'));
	}

	if ( empty($post_author) )
		$post_author = $user_ID;

	if ( empty($post_status) )
		$post_status = 'draft';

	if ( empty($post_type) )
		$post_type = 'post';

	// Get the post ID and GUID
	if ( $update ) {
		$post_ID = (int) $ID;
		$guid = get_post_field( 'guid', $post_ID );
	}

	// Create a valid post name.  Drafts are allowed to have an empty
	// post name.
	if ( empty($post_name) ) {
		if ( 'draft' != $post_status )
			$post_name = sanitize_title($post_title);
	} else {
		$post_name = sanitize_title($post_name);
	}

	// If the post date is empty (due to having been new or a draft) and status is not 'draft', set date to now
	if ( empty($post_date) || '0000-00-00 00:00:00' == $post_date ) {
		if ( !in_array($post_status, array('draft', 'pending')) )
			$post_date = current_time('mysql');
		else
			$post_date = '0000-00-00 00:00:00';
	}

	if ( empty($post_date_gmt) || '0000-00-00 00:00:00' == $post_date_gmt ) {
		if ( !in_array($post_status, array('draft', 'pending')) )
			$post_date_gmt = get_gmt_from_date($post_date);
		else
			$post_date_gmt = '0000-00-00 00:00:00';
	}

	if ( $update || '0000-00-00 00:00:00' == $post_date ) {
		$post_modified     = current_time( 'mysql' );
		$post_modified_gmt = current_time( 'mysql', 1 );
	} else {
		$post_modified     = $post_date;
		$post_modified_gmt = $post_date_gmt;
	}

	if ( 'publish' == $post_status ) {
		$now = gmdate('Y-m-d H:i:59');
		if ( mysql2date('U', $post_date_gmt) > mysql2date('U', $now) )
			$post_status = 'future';
	}

	if ( empty($comment_status) ) {
		if ( $update )
			$comment_status = 'closed';
		else
			$comment_status = get_option('default_comment_status');
	}
	if ( empty($ping_status) )
		$ping_status = get_option('default_ping_status');

	if ( isset($to_ping) )
		$to_ping = preg_replace('|\s+|', "\n", $to_ping);
	else
		$to_ping = '';

	if ( ! isset($pinged) )
		$pinged = '';

	if ( isset($post_parent) )
		$post_parent = (int) $post_parent;
	else
		$post_parent = 0;

	if ( isset($menu_order) )
		$menu_order = (int) $menu_order;
	else
		$menu_order = 0;

	if ( !isset($post_password) )
		$post_password = '';

	if ( 'draft' != $post_status ) {
		$post_name_check = $wpdb->get_var($wpdb->prepare("SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d AND post_parent = %d LIMIT 1", $post_name, $post_type, $post_ID, $post_parent));

		if ($post_name_check || in_array($post_name, $wp_rewrite->feeds) ) {
			$suffix = 2;
			do {
				$alt_post_name = substr($post_name, 0, 200-(strlen($suffix)+1)). "-$suffix";
				$post_name_check = $wpdb->get_var($wpdb->prepare("SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d AND post_parent = %d LIMIT 1", $alt_post_name, $post_type, $post_ID, $post_parent));
				$suffix++;
			} while ($post_name_check);
			$post_name = $alt_post_name;
		}
	}

	// expected_slashed (everything!)
	$data = compact( array( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'guid' ) );
	$data = stripslashes_deep( $data );
	$where = array( 'ID' => $post_ID );

	if ($update) {
		do_action( 'pre_post_update', $post_ID );
		if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
			if ( $wp_error )
				return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error);
			else
				return 0;
		}
	} else {
		$data['post_mime_type'] = stripslashes( $post_mime_type ); // This isn't in the update
		if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
			if ( $wp_error )
				return new WP_Error('db_insert_error', __('Could not insert post into the database'), $wpdb->last_error);
			else
				return 0;	
		}
		$post_ID = (int) $wpdb->insert_id;

		// use the newly generated $post_ID
		$where = array( 'ID' => $post_ID );
	}

	if ( empty($post_name) && 'draft' != $post_status ) {
		$post_name = sanitize_title($post_title, $post_ID);
		$wpdb->update( $wpdb->posts, compact( 'post_name' ), $where );
	}

	wp_set_post_categories( $post_ID, $post_category );
	wp_set_post_tags( $post_ID, $tags_input );

	$current_guid = get_post_field( 'guid', $post_ID );

	if ( 'page' == $post_type )
		clean_page_cache($post_ID);
	else
		clean_post_cache($post_ID);

	// Set GUID
	if ( !$update && '' == $current_guid )
		$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );

	$post = get_post($post_ID);

	if ( !empty($page_template) && 'page' == $post_type ) {
		$post->page_template = $page_template;
		$page_templates = get_page_templates();
		if ( 'default' != $page_template && !in_array($page_template, $page_templates) ) {
			if ( $wp_error )
				return new WP_Error('invalid_page_template', __('The page template is invalid.'));
			else
				return 0;
		}
		update_post_meta($post_ID, '_wp_page_template',  $page_template);
	}

	wp_transition_post_status($post_status, $previous_status, $post);

	if ( $update)
		do_action('edit_post', $post_ID, $post);

	do_action('save_post', $post_ID, $post);
	do_action('wp_insert_post', $post_ID, $post);

	return $post_ID;
}

/**
 * wp_update_post() - Update a post
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.0.0
 * @uses $wpdb
 *
 * @param array $postarr post data
 * @return int {@internal Missing Description}}
 */
function wp_update_post($postarr = array()) {
	if ( is_object($postarr) )
		$postarr = get_object_vars($postarr);

	// First, get all of the original fields
	$post = wp_get_single_post($postarr['ID'], ARRAY_A);

	// Escape data pulled from DB.
	$post = add_magic_quotes($post);

	// Passed post category list overwrites existing category list if not empty.
	if ( isset($postarr['post_category']) && is_array($postarr['post_category'])
			 && 0 != count($postarr['post_category']) )
		$post_cats = $postarr['post_category'];
	else
		$post_cats = $post['post_category'];

	// Drafts shouldn't be assigned a date unless explicitly done so by the user
	if ( in_array($post['post_status'], array('draft', 'pending')) && empty($postarr['edit_date']) && empty($postarr['post_date']) &&
			 ('0000-00-00 00:00:00' == $post['post_date']) )
		$clear_date = true;
	else
		$clear_date = false;

	// Merge old and new fields with new fields overwriting old ones.
	$postarr = array_merge($post, $postarr);
	$postarr['post_category'] = $post_cats;
	if ( $clear_date ) {
		$postarr['post_date'] = '';
		$postarr['post_date_gmt'] = '';
	}

	if ($postarr['post_type'] == 'attachment')
		return wp_insert_attachment($postarr);

	return wp_insert_post($postarr);
}

/**
 * wp_publish_post() - Mark a post as "published"
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.1
 * @uses $wpdb
 *
 * @param int $post_id Post ID
 * @return int|null {@internal Missing Description}}
 */
function wp_publish_post($post_id) {
	global $wpdb;

	$post = get_post($post_id);

	if ( empty($post) )
		return;

	if ( 'publish' == $post->post_status )
		return;

	$wpdb->update( $wpdb->posts, array( 'post_status' => 'publish' ), array( 'ID' => $post_id ) );

	$old_status = $post->post_status;
	$post->post_status = 'publish';
	wp_transition_post_status('publish', $old_status, $post);

	// Update counts for the post's terms.
	foreach ( get_object_taxonomies('post') as $taxonomy ) {
		$terms = wp_get_object_terms($post_id, $taxonomy, 'fields=tt_ids');
		wp_update_term_count($terms, $taxonomy);
	}

	do_action('edit_post', $post_id, $post);
	do_action('save_post', $post_id, $post);
	do_action('wp_insert_post', $post_id, $post);
}

/**
 * check_and_publish_future_post() - check to make sure post has correct status before
 * passing it on to be published. Invoked by cron 'publish_future_post' event
 * This safeguard prevents cron from publishing drafts, etc.
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.5
 * @uses $wpdb
 *
 * @param int $post_id Post ID
 * @return int|null {@internal Missing Description}}
 */
function check_and_publish_future_post($post_id) {

	$post = get_post($post_id);

	if ( empty($post) )
		return;

	if ( 'future' != $post->post_status )
		return;

	return wp_publish_post($post_id);
}

/**
 * wp_add_post_tags() - Adds the tags to a post
 *
 * @uses wp_set_post_tags() Same first two paraeters, but the last parameter is always set to true.
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.3
 *
 * @param int $post_id Optional. Post ID
 * @param string $tags The tags to set for the post
 * @return bool|null Will return false if $post_id is not an integer or is 0. Will return null otherwise
 */
function wp_add_post_tags($post_id = 0, $tags = '') {
	return wp_set_post_tags($post_id, $tags, true);
}

/**
 * wp_set_post_tags() - Set the tags for a post
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.3
 * @uses $wpdb
 *
 * @param int $post_id post ID
 * @param string $tags The tags to set for the post
 * @param bool $append If true, don't delete existing tags, just add on. If false, replace the tags with the new tags.
 * @return bool|null Will return false if $post_id is not an integer or is 0. Will return null otherwise
 */
function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) {

	$post_id = (int) $post_id;

	if ( !$post_id )
		return false;

	if ( empty($tags) )
		$tags = array();
	$tags = (is_array($tags)) ? $tags : explode( ',', trim($tags, " \n\t\r\0\x0B,") );
	wp_set_object_terms($post_id, $tags, 'post_tag', $append);
}

/**
 * wp_set_post_categories() - Set categories for a post
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.1
 * @uses $wpdb
 *
 * @param int $post_ID post ID
 * @param array $post_categories
 * @return bool|mixed {@internal Missing Description}}
 */
function wp_set_post_categories($post_ID = 0, $post_categories = array()) {
	$post_ID = (int) $post_ID;
	// If $post_categories isn't already an array, make it one:
	if (!is_array($post_categories) || 0 == count($post_categories) || empty($post_categories))
		$post_categories = array(get_option('default_category'));
	else if ( 1 == count($post_categories) && '' == $post_categories[0] )
		return true;

	$post_categories = array_map('intval', $post_categories);
	$post_categories = array_unique($post_categories);

	return wp_set_object_terms($post_ID, $post_categories, 'category');
}	// wp_set_post_categories()

/**
 * wp_transition_post_status() - Change the post transition status
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 2.3
 *
 * @param string $new_status {@internal Missing Description}}
 * @param string $old_status {@internal Missing Description}}
 * @param int $post {@internal Missing Description}}
 */
function wp_transition_post_status($new_status, $old_status, $post) {
	if ( $new_status != $old_status ) {
		do_action('transition_post_status', $new_status, $old_status, $post);
		do_action("${old_status}_to_$new_status", $post);
	}
	do_action("${new_status}_$post->post_type", $post->ID, $post);
}

//
// Trackback and ping functions
//

/**
 * add_ping() - Add a URL to those already pung
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5
 * @uses $wpdb
 *
 * @param int $post_id post ID
 * @param string $uri {@internal Missing Description}}
 * @return mixed {@internal Missing Description}}
 */
function add_ping($post_id, $uri) {
	global $wpdb;
	$pung = $wpdb->get_var( $wpdb->prepare( "SELECT pinged FROM $wpdb->posts WHERE ID = %d", $post_id ));
	$pung = trim($pung);
	$pung = preg_split('/\s/', $pung);
	$pung[] = $uri;
	$new = implode("\n", $pung);
	$new = apply_filters('add_ping', $new);
	// expected_slashed ($new)
	$new = stripslashes($new);
	return $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post_id ) );
}

/**
 * get_enclosed() - Get enclosures already enclosed for a post
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5
 * @uses $wpdb
 *
 * @param int $post_id post ID
 * @return array {@internal Missing Description}}
 */
function get_enclosed($post_id) {
	$custom_fields = get_post_custom( $post_id );
	$pung = array();
	if ( !is_array( $custom_fields ) )
		return $pung;

	foreach ( $custom_fields as $key => $val ) {
		if ( 'enclosure' != $key || !is_array( $val ) )
			continue;
		foreach( $val as $enc ) {
			$enclosure = split( "\n", $enc );
			$pung[] = trim( $enclosure[ 0 ] );
		}
	}
	$pung = apply_filters('get_enclosed', $pung);
	return $pung;
}

/**
 * get_pung() - Get URLs already pinged for a post
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5
 * @uses $wpdb
 *
 * @param int $post_id post ID
 * @return array {@internal Missing Description}}
 */
function get_pung($post_id) {
	global $wpdb;
	$pung = $wpdb->get_var( $wpdb->prepare( "SELECT pinged FROM $wpdb->posts WHERE ID = %d", $post_id ));
	$pung = trim($pung);
	$pung = preg_split('/\s/', $pung);
	$pung = apply_filters('get_pung', $pung);
	return $pung;
}

/**
 * get_to_ping() - Get any URLs in the todo list
 *
 * {@internal Missing Long Description}}
 *
 * @package WordPress
 * @subpackage Post
 * @since 1.5
 * @uses $wpdb
 *
 * @param int $post_id post ID
 * @return array {@internal Missing Description}}
 */
function get_to_ping($post_id) {
	global $wpdb;
	$to_ping = $wpdb->get_var( $wpdb->prepare( "SELECT to_ping FROM $wpdb->posts WHERE ID = %d", $post_id ));
	$to_ping = trim($to_ping);
	$to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY);
	$to_ping = apply_filters('get_to_ping',  $to_ping);
	return $to_ping;
}

/**
 * trackback_url_list() - Do trackbacks for a list of urls
 *
 * {@inte…