<?php

/**

 * Post functions and post utility function.

 *

 * @package WordPress

 * @subpackage Post

 * @since 1.5.0

 */

//

// Post Type Registration

//

/**

 * Creates the initial post types when 'init' action is fired.

 */

function create_initial_post_types() {

	register_post_type( 'post', array('exclude_from_search' => false) );

	register_post_type( 'page', array('exclude_from_search' => false) );

	register_post_type( 'attachment', array('exclude_from_search' => false) );

	register_post_type( 'revision', array('exclude_from_search' => true) );

}

add_action( 'init', 'create_initial_post_types', 0 ); // highest priority

/**

 * 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.

 *

 * @since 2.0.0

 * @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 the file is relative, prepend upload dir

	if ( 0 !== strpos($file, '/') && !preg_match('|^.:\\\|', $file) && ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) )

		$file = $uploads['basedir'] . "/$file";

	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.

 *

 * @since 2.1.0

 * @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 );

	$file = _wp_relative_upload_path($file);

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

}

/**

 * Return relative path to an uploaded file.

 *

 * The path is relative to the current upload dir.

 *

 * @since 2.9

 * @uses apply_filters() Calls '_wp_relative_upload_path' on file path.

 *

 * @param string $path Full path to the file

 * @return string relative path on success, unchanged path on failure.

 */

function _wp_relative_upload_path( $path ) {

	$new_path = $path;

	if ( ($uploads = wp_upload_dir()) && false === $uploads['error'] ) {

		if ( 0 === strpos($new_path, $uploads['basedir']) ) {

				$new_path = str_replace($uploads['basedir'], '', $new_path);

				$new_path = ltrim($new_path, '/');

		}

	}

	return apply_filters( '_wp_relative_upload_path', $new_path, $path );

}

/**

 * 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

 * {@link get_posts()} function. The arguments are combined with the

 * get_children defaults and are then passed to the {@link get_posts()}

 * function, which accepts additional arguments. You can replace the defaults in

 * this function, listed below and the additional arguments listed in the

 * {@link 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.

 *

 * @since 2.0.0

 *

 * @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) {

	$kids = array();

	if ( empty( $args ) ) {

		if ( isset( $GLOBALS['post'] ) ) {

			$args = array('post_parent' => (int) $GLOBALS['post']->post_parent );

		} else {

			return $kids;

		}

	} 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' => 'any',

		'post_status' => 'any', 'post_parent' => 0,

	);

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

	$children = get_posts( $r );

	if ( !$children )

		return $kids;

	update_post_cache($children);

	foreach ( $children as $key => $child )

		$kids[$child->ID] =& $children[$key];

	if ( $output == OBJECT ) {

		return $kids;

	} elseif ( $output == ARRAY_A ) {

		foreach ( (array) $kids as $kid )

			$weeuns[$kid->ID] = get_object_vars($kids[$kid->ID]);

		return $weeuns;

	} elseif ( $output == ARRAY_N ) {

		foreach ( (array) $kids as $kid )

			$babes[$kid->ID] = array_values(get_object_vars($kids[$kid->ID]));

		return $babes;

	} else {

		return $kids;

	}

}

/**

 * Get extended entry info (<!--more-->).

 *

 * There should not be any space after the second dash and before the word

 * 'more'. There can be text or space(s) after the word 'more', but won't be

 * referenced.

 *

 * The returned array has 'main' and 'extended' keys. Main has the text before

 * the <code><!--more--></code>. The 'extended' key has the content after the

 * <code><!--more--></code> comment.

 *

 * @since 1.0.0

 *

 * @param string $post Post content.

 * @return array Post before ('main') and after ('extended').

 */

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);

}

/**

 * Retrieves post data given a post ID or post object.

 *

 * See {@link sanitize_post()} for optional $filter values. Also, the parameter

 * $post, must be given as a variable, since it is passed by reference.

 *

 * @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 Optional, default is Object. Either OBJECT, ARRAY_A, or ARRAY_N.

 * @param string $filter Optional, default is raw.

 * @return mixed Post data

 */

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($post) && empty($post->filter) ) {

		_get_post_ancestors($post);

		$_post = sanitize_post($post, 'raw');

		wp_cache_add($post->ID, $_post, 'posts');

	} else {

		if ( is_object($post) )

			$post = $post->ID;

		$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);

			$_post = sanitize_post($_post, 'raw');

			wp_cache_add($_post->ID, $_post, 'posts');

		}

	}

	if ($filter != 'raw')

		$_post = sanitize_post($_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.

 *

 * @since 2.5.0

 *

 * @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.

 *

 * @since 2.3.0

 * @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.

 *

 * @since 2.0.0

 *

 * @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.

 *

 * @since 2.0.0

 *

 * @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.

 *

 * @since 2.5.0

 *

 * @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.

 *

 * @since 2.5.0

 *

 * @return array List of page statuses.

 */

function get_page_statuses( ) {

	$status = array(

		'draft'			=> __('Draft'),

		'private'		=> __('Private'),

		'publish'		=> __('Published')

	);

	return $status;

}

/**

 * Retrieve the post type of the current post or of a given post.

 *

 * @since 2.1.0

 *

 * @uses $wpdb

 * @uses $posts The Loop post global

 *

 * @param mixed $post Optional. Post object or post ID.

 * @return bool|string post type or false on failure.

 */

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;

}

/**

 * Get a list of all registered post type objects.

 *

 * @package WordPress

 * @subpackage Post

 * @since 2.9.0

 * @uses $wp_post_types

 * @see register_post_type

 * @see get_post_types

 *

 * @param array|string $args An array of key => value arguments to match against the post types.

 *  Only post types having attributes that match all arguments are returned.

 * @param string $output The type of output to return, either post type 'names' or 'objects'. 'names' is the default.

 * @return array A list of post type names or objects

 */

function get_post_types( $args = array(), $output = 'names' ) {

	global $wp_post_types;

	$do_names = false;

	if ( 'names' == $output )

		$do_names = true;

	$post_types = array();

	foreach ( (array) $wp_post_types as $post_type ) {

		if ( empty($args) ) {

			if ( $do_names )

				$post_types[] = $post_type->name;

			else

				$post_types[] = $post_type;

		} elseif ( array_intersect_assoc((array) $post_type, $args) ) {

			if ( $do_names )

				$post_types[] = $post_type->name;

			else

				$post_types[] = $post_type;

		}

	}

	return $post_types;

}

/**

 * Register a post type. Do not use before init.

 *

 * A simple function for creating or modifying a post type based on the

 * parameters given. The function will accept an array (second optional

 * parameter), along with a string for the post type name.

 *

 *

 * Optional $args contents:

 *

 * exclude_from_search - Whether to exclude posts with this post type from search results. Defaults to true.

 *