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WordPress/wp-includes/post.php

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<?php
//
// Post functions
//
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 );
}
function update_attached_file( $attachment_id, $file ) {
if ( !get_post( $attachment_id ) )
return false;
$old_file = get_attached_file( $attachment_id, true );
$file = apply_filters( 'update_attached_file', $file, $attachment_id );
if ( $old_file )
return update_post_meta( $attachment_id, '_wp_attached_file', $file, $old_file );
else
return add_post_meta( $attachment_id, '_wp_attached_file', $file );
}
function &get_children($args = '', $output = OBJECT) {
global $post_cache, $wpdb, $blog_id;
if ( empty($args) ) {
if ( isset($GLOBALS['post']) )
$r = array('post_parent' => & $GLOBALS['post']->post_parent);
else
return false;
} elseif ( is_object($args) )
$r = array('post_parent' => $post->post_parent);
elseif ( is_numeric($args) )
$r = array('post_parent' => $args);
elseif ( is_array($args) )
$r = &$args;
else
parse_str($args, $r);
$defaults = array('numberposts' => -1, 'post_type' => '', 'post_status' => '', 'post_parent' => 0);
$r = array_merge($defaults, $r);
$children = get_posts( $r );
if ( $children ) {
foreach ( $children as $key => $child ) {
$post_cache[$blog_id][$child->ID] =& $children[$key];
$kids[$child->ID] =& $children[$key];
}
} else {
return false;
}
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 $kids;
}
}
// get extended entry info (<!--more-->)
function get_extended($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' => $extended);
}
// Retrieves post data given a post ID or post object.
// Handles post caching.
function &get_post(&$post, $output = OBJECT) {
global $post_cache, $wpdb, $blog_id;
if ( empty($post) ) {
if ( isset($GLOBALS['post']) )
$_post = & $GLOBALS['post'];
else
$_post = null;
} elseif ( is_object($post) ) {
if ( 'page' == $post->post_type )
return get_page($post, $output);
if ( !isset($post_cache[$blog_id][$post->ID]) )
$post_cache[$blog_id][$post->ID] = &$post;
$_post = & $post_cache[$blog_id][$post->ID];
} else {
$post = (int) $post;
if ( $_post = wp_cache_get($post, 'pages') )
return get_page($_post, $output);
elseif ( isset($post_cache[$blog_id][$post]) )
$_post = & $post_cache[$blog_id][$post];
else {
$query = "SELECT * FROM $wpdb->posts WHERE ID = '$post' LIMIT 1";
$_post = & $wpdb->get_row($query);
if ( 'page' == $_post->post_type )
return get_page($_post, $output);
$post_cache[$blog_id][$post] = & $_post;
}
}
if ( defined('WP_IMPORTING') )
unset($post_cache[$blog_id]);
if ( $output == OBJECT ) {
return $_post;
} elseif ( $output == ARRAY_A ) {
return get_object_vars($_post);
} elseif ( $output == ARRAY_N ) {
return array_values(get_object_vars($_post));
} else {
return $_post;
}
}
// Takes a post ID, returns its mime type.
function get_post_mime_type($ID = '') {
$post = & get_post($ID);
if ( is_object($post) )
return $post->post_mime_type;
return false;
}
function get_post_status($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 $post->post_status;
}
return false;
}
function get_post_type($post = false) {
global $wpdb, $posts;
if ( false === $post )
$post = $posts[0];
elseif ( (int) $post )
$post = get_post($post, OBJECT);
if ( is_object($post) )
return $post->post_type;
return false;
}
function get_posts($args) {
global $wpdb;
if ( is_array($args) )
$r = &$args;
else
parse_str($args, $r);
$defaults = array('numberposts' => 5, 'offset' => 0, 'category' => 0,
'orderby' => 'post_date', 'order' => 'DESC', 'include' => '', 'exclude' => '',
'meta_key' => '', 'meta_value' =>'', 'post_type' => 'post', 'post_status' => 'publish', 'post_parent' => 0);
$r = array_merge($defaults, $r);
extract($r);
$numberposts = (int) $numberposts;
$offset = (int) $offset;
$category = (int) $category;
$post_parent = (int) $post_parent;
$inclusions = '';
if ( !empty($include) ) {
$offset = 0; //ignore offset, category, exclude, meta_key, and meta_value, post_parent if using include
$category = 0;
$exclude = '';
$meta_key = '';
$meta_value = '';
$post_parent = 0;
$incposts = preg_split('/[\s,]+/',$include);
$numberposts = count($incposts); // only the number of posts included
if ( count($incposts) ) {
foreach ( $incposts as $incpost ) {
if (empty($inclusions))
$inclusions = ' AND ( ID = ' . intval($incpost) . ' ';
else
$inclusions .= ' OR ID = ' . intval($incpost) . ' ';
}
}
}
if (!empty($inclusions))
$inclusions .= ')';
$exclusions = '';
if ( !empty($exclude) ) {
$exposts = preg_split('/[\s,]+/',$exclude);
if ( count($exposts) ) {
foreach ( $exposts as $expost ) {
if (empty($exclusions))
$exclusions = ' AND ( ID <> ' . intval($expost) . ' ';
else
$exclusions .= ' AND ID <> ' . intval($expost) . ' ';
}
}
}
if (!empty($exclusions))
$exclusions .= ')';
$query = "SELECT DISTINCT * FROM $wpdb->posts ";
$query .= empty( $category ) ? '' : ", $wpdb->post2cat ";
$query .= empty( $meta_key ) ? '' : ", $wpdb->postmeta ";
$query .= " WHERE 1=1 ";
$query .= empty( $post_type ) ? '' : "AND post_type = '$post_type' ";
$query .= empty( $post_status ) ? '' : "AND post_status = '$post_status' ";
$query .= "$exclusions $inclusions " ;
$query .= empty( $category ) ? '' : "AND ($wpdb->posts.ID = $wpdb->post2cat.post_id AND $wpdb->post2cat.category_id = " . $category. ") ";
$query .= empty( $post_parent ) ? '' : "AND $wpdb->posts.post_parent = '$post_parent' ";
$query .= empty( $meta_key ) | empty($meta_value) ? '' : " AND ($wpdb->posts.ID = $wpdb->postmeta.post_id AND $wpdb->postmeta.meta_key = '$meta_key' AND $wpdb->postmeta.meta_value = '$meta_value' )";
$query .= " GROUP BY $wpdb->posts.ID ORDER BY " . $orderby . ' ' . $order;
if ( 0 < $numberposts )
$query .= " LIMIT " . $offset . ',' . $numberposts;
$posts = $wpdb->get_results($query);
update_post_caches($posts);
return $posts;
}
//
// Post meta functions
//
function add_post_meta($post_id, $key, $value, $unique = false) {
global $wpdb, $post_meta_cache, $blog_id;
$post_id = (int) $post_id;
if ( $unique ) {
if ( $wpdb->get_var("SELECT meta_key FROM $wpdb->postmeta WHERE meta_key = '$key' AND post_id = '$post_id'") ) {
return false;
}
}
$post_meta_cache[$blog_id][$post_id][$key][] = $value;
$value = maybe_serialize($value);
$value = $wpdb->escape($value);
$wpdb->query("INSERT INTO $wpdb->postmeta (post_id,meta_key,meta_value) VALUES ('$post_id','$key','$value')");
return true;
}
function delete_post_meta($post_id, $key, $value = '') {
global $wpdb, $post_meta_cache, $blog_id;
$post_id = (int) $post_id;
if ( empty($value) ) {
$meta_id = $wpdb->get_var("SELECT meta_id FROM $wpdb->postmeta WHERE post_id = '$post_id' AND meta_key = '$key'");
} else {
$meta_id = $wpdb->get_var("SELECT meta_id FROM $wpdb->postmeta WHERE post_id = '$post_id' AND meta_key = '$key' AND meta_value = '$value'");
}
if ( !$meta_id )
return false;
if ( empty($value) ) {
$wpdb->query("DELETE FROM $wpdb->postmeta WHERE post_id = '$post_id' AND meta_key = '$key'");
unset($post_meta_cache[$blog_id][$post_id][$key]);
} else {
$wpdb->query("DELETE FROM $wpdb->postmeta WHERE post_id = '$post_id' AND meta_key = '$key' AND meta_value = '$value'");
$cache_key = $post_meta_cache[$blog_id][$post_id][$key];
if ($cache_key) foreach ( $cache_key as $index => $data )
if ( $data == $value )
unset($post_meta_cache[$blog_id][$post_id][$key][$index]);
}
unset($post_meta_cache[$blog_id][$post_id][$key]);
return true;
}
function get_post_meta($post_id, $key, $single = false) {
global $wpdb, $post_meta_cache, $blog_id;
$post_id = (int) $post_id;
if ( isset($post_meta_cache[$blog_id][$post_id][$key]) ) {
if ( $single ) {
return maybe_unserialize( $post_meta_cache[$blog_id][$post_id][$key][0] );
} else {
return maybe_unserialize( $post_meta_cache[$blog_id][$post_id][$key] );
}
}
if ( !isset($post_meta_cache[$blog_id][$post_id]) )
update_postmeta_cache($post_id);
if ( $single ) {
if ( isset($post_meta_cache[$blog_id][$post_id][$key][0]) )
return maybe_unserialize($post_meta_cache[$blog_id][$post_id][$key][0]);
else
return '';
} else {
return maybe_unserialize($post_meta_cache[$blog_id][$post_id][$key]);
}
}
function update_post_meta($post_id, $key, $value, $prev_value = '') {
global $wpdb, $post_meta_cache, $blog_id;
$post_id = (int) $post_id;
$original_value = $value;
$value = maybe_serialize($value);
$value = $wpdb->escape($value);
$original_prev = $prev_value;
$prev_value = maybe_serialize($prev_value);
$prev_value = $wpdb->escape($prev_value);
if (! $wpdb->get_var("SELECT meta_key FROM $wpdb->postmeta WHERE meta_key = '$key' AND post_id = '$post_id'") ) {
return false;
}
if ( empty($prev_value) ) {
$wpdb->query("UPDATE $wpdb->postmeta SET meta_value = '$value' WHERE meta_key = '$key' AND post_id = '$post_id'");
$cache_key = $post_meta_cache[$blog_id][$post_id][$key];
if ( !empty($cache_key) )
foreach ($cache_key as $index => $data)
$post_meta_cache[$blog_id][$post_id][$key][$index] = $original_value;
} else {
$wpdb->query("UPDATE $wpdb->postmeta SET meta_value = '$value' WHERE meta_key = '$key' AND post_id = '$post_id' AND meta_value = '$prev_value'");
$cache_key = $post_meta_cache[$blog_id][$post_id][$key];
if ( !empty($cache_key) )
foreach ($cache_key as $index => $data)
if ( $data == $original_prev )
$post_meta_cache[$blog_id][$post_id][$key][$index] = $original_value;
}
return true;
}
function get_post_custom($post_id = 0) {
global $id, $post_meta_cache, $wpdb, $blog_id;
if ( !$post_id )
$post_id = (int) $id;
$post_id = (int) $post_id;
if ( !isset($post_meta_cache[$blog_id][$post_id]) )
update_postmeta_cache($post_id);
return $post_meta_cache[$blog_id][$post_id];
}
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;
}
function get_post_custom_values( $key = '', $post_id = 0 ) {
$custom = get_post_custom($post_id);
return $custom[$key];
}
function wp_delete_post($postid = 0) {
global $wpdb, $wp_rewrite;
$postid = (int) $postid;
if ( !$post = $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE ID = $postid") )
return $post;
if ( 'attachment' == $post->post_type )
return wp_delete_attachment($postid);
do_action('delete_post', $postid);
if ( 'publish' == $post->post_status && 'post' == $post->post_type ) {
$categories = wp_get_post_categories($post->ID);
if( is_array( $categories ) ) {
foreach ( $categories as $cat_id ) {
$wpdb->query("UPDATE $wpdb->categories SET category_count = category_count - 1 WHERE cat_ID = '$cat_id'");
wp_cache_delete($cat_id, 'category');
do_action('edit_category', $cat_id);
}
}
}
if ( 'page' == $post->post_type )
$wpdb->query("UPDATE $wpdb->posts SET post_parent = $post->post_parent WHERE post_parent = $postid AND post_type = 'page'");
$wpdb->query("UPDATE $wpdb->posts SET post_parent = $post->post_parent WHERE post_parent = $postid AND post_type = 'attachment'");
$wpdb->query("DELETE FROM $wpdb->posts WHERE ID = $postid");
$wpdb->query("DELETE FROM $wpdb->comments WHERE comment_post_ID = $postid");
$wpdb->query("DELETE FROM $wpdb->post2cat WHERE post_id = $postid");
$wpdb->query("DELETE FROM $wpdb->postmeta WHERE post_id = $postid");
if ( 'page' == $post->post_type ) {
clean_page_cache($postid);
$wp_rewrite->flush_rules();
}
return $post;
}
function wp_get_post_categories($post_id = 0) {
$post_id = (int) $post_id;
$cats = &get_the_category($post_id);
$cat_ids = array();
foreach ( $cats as $cat )
$cat_ids[] = (int) $cat->cat_ID;
return array_unique($cat_ids);
}
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();
}
function wp_get_single_post($postid = 0, $mode = OBJECT) {
global $wpdb;
$postid = (int) $postid;
$post = get_post($postid, $mode);
// Set categories
if($mode == OBJECT) {
$post->post_category = wp_get_post_categories($postid);
}
else {
$post['post_category'] = wp_get_post_categories($postid);
}
return $post;
}
function wp_insert_post($postarr = array()) {
global $wpdb, $wp_rewrite, $allowedtags, $user_ID;
if ( is_object($postarr) )
$postarr = get_object_vars($postarr);
// export array as variables
extract($postarr);
// Are we updating or creating?
$update = false;
if ( !empty($ID) ) {
$update = true;
$post = & get_post($ID);
$previous_status = $post->post_status;
}
// Get the basics.
if ( empty($no_filter) ) {
$post_content = apply_filters('content_save_pre', $post_content);
$post_content_filtered = apply_filters('content_filtered_save_pre', $post_content_filtered);
$post_excerpt = apply_filters('excerpt_save_pre', $post_excerpt);
$post_title = apply_filters('title_save_pre', $post_title);
$post_category = apply_filters('category_save_pre', $post_category);
$post_status = apply_filters('status_save_pre', $post_status);
$post_name = apply_filters('name_save_pre', $post_name);
$comment_status = apply_filters('comment_status_pre', $comment_status);
$ping_status = apply_filters('ping_status_pre', $ping_status);
}
if ( ('' == $post_content) && ('' == $post_title) && ('' == $post_excerpt) )
return 0;
// Make sure we set a valid category
if (0 == count($post_category) || !is_array($post_category)) {
$post_category = array(get_option('default_category'));
}
$post_cat = $post_category[0];
if ( empty($post_author) )
$post_author = $user_ID;
if ( empty($post_status) )
$post_status = 'draft';
if ( empty($post_type) )
$post_type = 'post';
// Get the post ID.
if ( $update )
$post_ID = (int) $ID;
// Create a valid post name. Drafts are allowed to have an empty
// post name.
if ( empty($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)) {
if ( 'draft' != $post_status )
$post_date = current_time('mysql');
}
if (empty($post_date_gmt)) {
if ( 'draft' != $post_status )
$post_date_gmt = get_gmt_from_date($post_date);
}
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) )
$ping_status = get_option('default_ping_status');
if ( empty($post_pingback) )
$post_pingback = get_option('default_pingback_flag');
if ( isset($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("SELECT post_name FROM $wpdb->posts WHERE post_name = '$post_name' AND post_type = '$post_type' AND ID != '$post_ID' AND post_parent = '$post_parent' LIMIT 1");
if ($post_name_check || in_array($post_name, $wp_rewrite->feeds) ) {
$suffix = 2;
do {
$alt_post_name = $post_name . "-$suffix";
$post_name_check = $wpdb->get_var("SELECT post_name FROM $wpdb->posts WHERE post_name = '$alt_post_name' AND post_type = '$post_type' AND ID != '$post_ID' AND post_parent = '$post_parent' LIMIT 1");
$suffix++;
} while ($post_name_check);
$post_name = $alt_post_name;
}
}
if ($update) {
$wpdb->query(
"UPDATE IGNORE $wpdb->posts SET
post_author = '$post_author',
post_date = '$post_date',
post_date_gmt = '$post_date_gmt',
post_content = '$post_content',
post_content_filtered = '$post_content_filtered',
post_title = '$post_title',
post_excerpt = '$post_excerpt',
post_status = '$post_status',
post_type = '$post_type',
comment_status = '$comment_status',
ping_status = '$ping_status',
post_password = '$post_password',
post_name = '$post_name',
to_ping = '$to_ping',
pinged = '$pinged',
post_modified = '".current_time('mysql')."',
post_modified_gmt = '".current_time('mysql',1)."',
post_parent = '$post_parent',
menu_order = '$menu_order'
WHERE ID = $post_ID");
} else {
$wpdb->query(
"INSERT IGNORE INTO $wpdb->posts
(post_author, post_date, post_date_gmt, post_content, post_content_filtered, post_title, post_excerpt, post_status, post_type, comment_status, ping_status, post_password, post_name, to_ping, pinged, post_modified, post_modified_gmt, post_parent, menu_order, post_mime_type)
VALUES
('$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', '$post_date', '$post_date_gmt', '$post_parent', '$menu_order', '$post_mime_type')");
$post_ID = (int) $wpdb->insert_id;
}
if ( empty($post_name) && 'draft' != $post_status ) {
$post_name = sanitize_title($post_title, $post_ID);
$wpdb->query( "UPDATE $wpdb->posts SET post_name = '$post_name' WHERE ID = '$post_ID'" );
}
wp_set_post_categories($post_ID, $post_category);
if ( 'page' == $post_type ) {
clean_page_cache($post_ID);
$wp_rewrite->flush_rules();
} else {
clean_post_cache($post_ID);
}
// Set GUID
if ( ! $update )
$wpdb->query("UPDATE $wpdb->posts SET guid = '" . get_permalink($post_ID) . "' WHERE ID = '$post_ID'");
if ( $update) {
if ($previous_status != 'publish' && $post_status == 'publish') {
// Reset GUID if transitioning to publish.
$wpdb->query("UPDATE $wpdb->posts SET guid = '" . get_permalink($post_ID) . "' WHERE ID = '$post_ID'");
do_action('private_to_published', $post_ID);
}
do_action('edit_post', $post_ID);
}
if ($post_status == 'publish' && $post_type == 'post') {
do_action('publish_post', $post_ID);
if ( defined('XMLRPC_REQUEST') )
do_action('xmlrpc_publish_post', $post_ID);
if ( !defined('WP_IMPORTING') ) {
if ( $post_pingback )
$result = $wpdb->query("
INSERT INTO $wpdb->postmeta
(post_id,meta_key,meta_value)
VALUES ('$post_ID','_pingme','1')
");
$result = $wpdb->query("
INSERT INTO $wpdb->postmeta
(post_id,meta_key,meta_value)
VALUES ('$post_ID','_encloseme','1')
");
wp_schedule_single_event(time(), 'do_pings');
}
} else if ($post_type == 'page') {
if ( !empty($page_template) )
if ( ! update_post_meta($post_ID, '_wp_page_template', $page_template))
add_post_meta($post_ID, '_wp_page_template', $page_template, true);
if ( $post_status == 'publish' )
do_action('publish_page', $post_ID);
}
// Always clears the hook in case the post status bounced from future to draft.
wp_clear_scheduled_hook('publish_future_post', $post_ID);
// Schedule publication.
if ( 'future' == $post_status )
wp_schedule_single_event(strtotime($post_date_gmt. ' GMT'), 'publish_future_post', array($post_ID));
do_action('save_post', $post_ID);
do_action('wp_insert_post', $post_ID);
return $post_ID;
}
function wp_update_post($postarr = array()) {
global $wpdb;
if ( is_object($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 ( 'draft' == $post['post_status'] && empty($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);
}
function wp_publish_post($post_id) {
$post = get_post($post_id);
if ( empty($post) )
return;
if ( 'publish' == $post->post_status )
return;
return wp_update_post(array('post_status' => 'publish', 'ID' => $post_id, 'no_filter' => true));
}
function wp_set_post_categories($post_ID = 0, $post_categories = array()) {
global $wpdb;
$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'));
$post_categories = array_unique($post_categories);
// First the old categories
$old_categories = $wpdb->get_col("
SELECT category_id
FROM $wpdb->post2cat
WHERE post_id = '$post_ID'");
if (!$old_categories) {
$old_categories = array();
} else {
$old_categories = array_unique($old_categories);
}
// Delete any?
$delete_cats = array_diff($old_categories,$post_categories);
if ($delete_cats) {
foreach ($delete_cats as $del) {
$wpdb->query("
DELETE FROM $wpdb->post2cat
WHERE category_id = '$del'
AND post_id = '$post_ID'
");
}
}
// Add any?
$add_cats = array_diff($post_categories, $old_categories);
if ($add_cats) {
foreach ($add_cats as $new_cat) {
$new_cat = (int) $new_cat;
if ( !empty($new_cat) )
$wpdb->query("
INSERT INTO $wpdb->post2cat (post_id, category_id)
VALUES ('$post_ID', '$new_cat')");
}
}
// Update category counts.
$all_affected_cats = array_unique(array_merge($post_categories, $old_categories));
foreach ( $all_affected_cats as $cat_id ) {
$count = $wpdb->get_var("SELECT COUNT(*) FROM $wpdb->post2cat, $wpdb->posts WHERE $wpdb->posts.ID=$wpdb->post2cat.post_id AND post_status = 'publish' AND post_type = 'post' AND category_id = '$cat_id'");
$wpdb->query("UPDATE $wpdb->categories SET category_count = '$count' WHERE cat_ID = '$cat_id'");
clean_category_cache($cat_id);
do_action('edit_category', $cat_id);
}
} // wp_set_post_categories()
//
// Trackback and ping functions
//
function add_ping($post_id, $uri) { // Add a URL to those already pung
global $wpdb;
$pung = $wpdb->get_var("SELECT pinged FROM $wpdb->posts WHERE ID = $post_id");
$pung = trim($pung);
$pung = preg_split('/\s/', $pung);
$pung[] = $uri;
$new = implode("\n", $pung);
$new = apply_filters('add_ping', $new);
return $wpdb->query("UPDATE $wpdb->posts SET pinged = '$new' WHERE ID = $post_id");
}
function get_enclosed($post_id) { // Get enclosures already enclosed for a post
global $wpdb;
$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 $pung;
}
function get_pung($post_id) { // Get URLs already pung for a post
global $wpdb;
$pung = $wpdb->get_var("SELECT pinged FROM $wpdb->posts WHERE ID = $post_id");
$pung = trim($pung);
$pung = preg_split('/\s/', $pung);
$pung = apply_filters('get_pung', $pung);
return $pung;
}
function get_to_ping($post_id) { // Get any URLs in the todo list
global $wpdb;
$to_ping = $wpdb->get_var("SELECT to_ping FROM $wpdb->posts WHERE ID = $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 $to_ping;
}
// do trackbacks for a list of urls
// accepts a comma-separated list of trackback urls and a post id
function trackback_url_list($tb_list, $post_id) {
if (!empty($tb_list)) {
// get post data
$postdata = wp_get_single_post($post_id, ARRAY_A);
// import postdata as variables
extract($postdata);
// form an excerpt
$excerpt = strip_tags($post_excerpt?$post_excerpt:$post_content);
if (strlen($excerpt) > 255) {
$excerpt = substr($excerpt,0,252) . '...';
}
$trackback_urls = explode(',', $tb_list);
foreach($trackback_urls as $tb_url) {
$tb_url = trim($tb_url);
trackback($tb_url, stripslashes($post_title), $excerpt, $post_id);
}
}
}
//
// Page functions
//
function get_all_page_ids() {
global $wpdb;
if ( ! $page_ids = wp_cache_get('all_page_ids', 'pages') ) {
$page_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE post_type = 'page'");
wp_cache_set('all_page_ids', $page_ids, 'pages');
}
return $page_ids;
}
// Retrieves page data given a page ID or page object.
// Handles page caching.
function &get_page(&$page, $output = OBJECT) {
global $wpdb, $blog_id;
if ( empty($page) ) {
if ( isset($GLOBALS['page']) ) {
$_page = & $GLOBALS['page'];
wp_cache_add($_page->ID, $_page, 'pages');
} else {
// shouldn't we just return NULL at this point? ~ Mark
$_page = null;
}
} elseif ( is_object($page) ) {
if ( 'post' == $page->post_type )
return get_post($page, $output);
wp_cache_add($page->ID, $page, 'pages');
$_page = $page;
} else {
$page = (int) $page;
// first, check the cache
if ( ! ( $_page = wp_cache_get($page, 'pages') ) ) {
// not in the page cache?
if ( isset($GLOBALS['page']->ID) && ($page == $GLOBALS['page']->ID) ) { // for is_page() views
// I don't think this code ever gets executed ~ Mark
$_page = & $GLOBALS['page'];
wp_cache_add($_page->ID, $_page, 'pages');
} elseif ( isset($GLOBALS['post_cache'][$blog_id][$page]) ) { // it's actually a page, and is cached
return get_post($page, $output);
} else { // it's not in any caches, so off to the DB we go
// Why are we using assignment for this query?
$_page = & $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE ID= '$page' LIMIT 1");
if ( 'post' == $_page->post_type )
return get_post($_page, $output);
// Potential issue: we're not checking to see if the post_type = 'page'
// So all non-'post' posts will get cached as pages.
wp_cache_set($_page->ID, $_page, 'pages');
}
}
}
// at this point, one way or another, $_post contains the page object
if ( $output == OBJECT ) {
return $_page;
} elseif ( $output == ARRAY_A ) {
return get_object_vars($_page);
} elseif ( $output == ARRAY_N ) {
return array_values(get_object_vars($_page));
} else {
return $_page;
}
}
function get_page_by_path($page_path, $output = OBJECT) {
global $wpdb;
$page_path = rawurlencode(urldecode($page_path));
$page_path = str_replace('%2F', '/', $page_path);
$page_path = str_replace('%20', ' ', $page_path);
$page_paths = '/' . trim($page_path, '/');
$leaf_path = sanitize_title(basename($page_paths));
$page_paths = explode('/', $page_paths);
foreach($page_paths as $pathdir)
$full_path .= ($pathdir!=''?'/':'') . sanitize_title($pathdir);
$pages = $wpdb->get_results("SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_name = '$leaf_path' AND post_type='page'");
if ( empty($pages) )
return NULL;
foreach ($pages as $page) {
$path = '/' . $leaf_path;
$curpage = $page;
while ($curpage->post_parent != 0) {
$curpage = $wpdb->get_row("SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE ID = '$curpage->post_parent' and post_type='page'");
$path = '/' . $curpage->post_name . $path;
}
if ( $path == $full_path )
return get_page($page->ID, $output);
}
return NULL;
}
function get_page_by_title($page_title, $output = OBJECT) {
global $wpdb;
$page_title = $wpdb->escape($page_title);
$page = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE post_title = '$page_title' AND post_type='page'");
if ( $page )
return get_page($page, $output);
return NULL;
}
function &get_page_children($page_id, $pages) {
global $page_cache, $blog_id;
if ( empty($pages) )
$pages = &$page_cache[$blog_id];
$page_list = array();
foreach ( $pages as $page ) {
if ( $page->post_parent == $page_id ) {
$page_list[] = $page;
if ( $children = get_page_children($page->ID, $pages) )
$page_list = array_merge($page_list, $children);
}
}
return $page_list;
}
//fetches the pages returned as a FLAT list, but arranged in order of their hierarchy, i.e., child parents
//immediately follow their parents
function get_page_hierarchy($posts, $parent = 0) {
$result = array ( );
if ($posts) { foreach ($posts as $post) {
if ($post->post_parent == $parent) {
$result[$post->ID] = $post->post_name;
$children = get_page_hierarchy($posts, $post->ID);
$result += $children; //append $children to $result
}
} }
return $result;
}
function get_page_uri($page_id) {
$page = get_page($page_id);
$uri = urldecode($page->post_name);
// A page cannot be it's own parent.
if ( $page->post_parent == $page->ID )
return $uri;
while ($page->post_parent != 0) {
$page = get_page($page->post_parent);
$uri = urldecode($page->post_name) . "/" . $uri;
}
return $uri;
}
function &get_pages($args = '') {
global $wpdb;
if ( is_array($args) )
$r = &$args;
else
parse_str($args, $r);
$defaults = array('child_of' => 0, 'sort_order' => 'ASC', 'sort_column' => 'post_title',
'hierarchical' => 1, 'exclude' => '', 'include' => '', 'meta_key' => '', 'meta_value' => '', 'authors' => '');
$r = array_merge($defaults, $r);
extract($r);
$key = md5( serialize( $r ) );
if ( $cache = wp_cache_get( 'get_pages', 'page' ) )
if ( isset( $cache[ $key ] ) )
return apply_filters('get_pages', $cache[ $key ], $r );
$inclusions = '';
if ( !empty($include) ) {
$child_of = 0; //ignore child_of, exclude, meta_key, and meta_value params if using include
$exclude = '';
$meta_key = '';
$meta_value = '';
$incpages = preg_split('/[\s,]+/',$include);
if ( count($incpages) ) {
foreach ( $incpages as $incpage ) {
if (empty($inclusions))
$inclusions = ' AND ( ID = ' . intval($incpage) . ' ';
else
$inclusions .= ' OR ID = ' . intval($incpage) . ' ';
}
}
}
if (!empty($inclusions))
$inclusions .= ')';
$exclusions = '';
if ( !empty($exclude) ) {
$expages = preg_split('/[\s,]+/',$exclude);
if ( count($expages) ) {
foreach ( $expages as $expage ) {
if (empty($exclusions))
$exclusions = ' AND ( ID <> ' . intval($expage) . ' ';
else
$exclusions .= ' AND ID <> ' . intval($expage) . ' ';
}
}
}
if (!empty($exclusions))
$exclusions .= ')';
$author_query = '';
if (!empty($authors)) {
$post_authors = preg_split('/[\s,]+/',$authors);
if ( count($post_authors) ) {
foreach ( $post_authors as $post_author ) {
//Do we have an author id or an author login?
if ( 0 == intval($post_author) ) {
$post_author = get_userdatabylogin($post_author);
if ( empty($post_author) )
continue;
if ( empty($post_author->ID) )
continue;
$post_author = $post_author->ID;
}
if ( '' == $author_query )
$author_query = ' post_author = ' . intval($post_author) . ' ';
else
$author_query .= ' OR post_author = ' . intval($post_author) . ' ';
}
if ( '' != $author_query )
$author_query = " AND ($author_query)";
}
}
$query = "SELECT * FROM $wpdb->posts " ;
$query .= ( empty( $meta_key ) ? "" : ", $wpdb->postmeta " ) ;
$query .= " WHERE (post_type = 'page' AND post_status = 'publish') $exclusions $inclusions " ;
$query .= ( empty( $meta_key ) | empty($meta_value) ? "" : " AND ($wpdb->posts.ID = $wpdb->postmeta.post_id AND $wpdb->postmeta.meta_key = '$meta_key' AND $wpdb->postmeta.meta_value = '$meta_value' )" ) ;
$query .= $author_query;
$query .= " ORDER BY " . $sort_column . " " . $sort_order ;
$pages = $wpdb->get_results($query);
$pages = apply_filters('get_pages', $pages, $r);
if ( empty($pages) )
return array();
// Update cache.
update_page_cache($pages);
if ( $child_of || $hierarchical )
$pages = & get_page_children($child_of, $pages);
$cache[ $key ] = $pages;
wp_cache_set( 'get_pages', $cache, 'page' );
return $pages;
}
function generate_page_uri_index() {
global $wpdb;
//get pages in order of hierarchy, i.e. children after parents
$posts = get_page_hierarchy($wpdb->get_results("SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'page'"));
//now reverse it, because we need parents after children for rewrite rules to work properly
$posts = array_reverse($posts, true);
$page_uris = array();
$page_attachment_uris = array();
if ($posts) {
foreach ($posts as $id => $post) {
// URL => page name
$uri = get_page_uri($id);
$attachments = $wpdb->get_results("SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'attachment' AND post_parent = '$id'");
if ( $attachments ) {
foreach ( $attachments as $attachment ) {
$attach_uri = get_page_uri($attachment->ID);
$page_attachment_uris[$attach_uri] = $attachment->ID;
}
}
$page_uris[$uri] = $id;
}
delete_option('page_uris');
update_option('page_uris', $page_uris);
if ( $page_attachment_uris ) {
delete_option('page_attachment_uris');
update_option('page_attachment_uris', $page_attachment_uris);
}
}
}
//
// Attachment functions
//
function is_local_attachment($url) {
if ( !strstr($url, get_bloginfo('home') ) )
return false;
if ( strstr($url, get_bloginfo('home') . '/?attachment_id=') )
return true;
if ( $id = url_to_postid($url) ) {
$post = & get_post($id);
if ( 'attachment' == $post->post_type )
return true;
}
return false;
}
function wp_insert_attachment($object, $file = false, $post_parent = 0) {
global $wpdb, $user_ID;
if ( is_object($object) )
$object = get_object_vars($object);
// Export array as variables
extract($object);
// Get the basics.
$post_content = apply_filters('content_save_pre', $post_content);
$post_content_filtered = apply_filters('content_filtered_save_pre', $post_content_filtered);
$post_excerpt = apply_filters('excerpt_save_pre', $post_excerpt);
$post_title = apply_filters('title_save_pre', $post_title);
$post_category = apply_filters('category_save_pre', $post_category);
$post_name = apply_filters('name_save_pre', $post_name);
$comment_status = apply_filters('comment_status_pre', $comment_status);
$ping_status = apply_filters('ping_status_pre', $ping_status);
$post_mime_type = apply_filters('post_mime_type_pre', $post_mime_type);
// Make sure we set a valid category
if (0 == count($post_category) || !is_array($post_category)) {
$post_category = array(get_option('default_category'));
}
$post_cat = $post_category[0];
if ( empty($post_author) )
$post_author = $user_ID;
$post_type = 'attachment';
$post_status = 'inherit';
// Are we updating or creating?
$update = false;
if ( !empty($ID) ) {
$update = true;
$post_ID = (int) $ID;
}
// Create a valid post name.
if ( empty($post_name) )
$post_name = sanitize_title($post_title);
else
$post_name = sanitize_title($post_name);
$post_name_check =
$wpdb->get_var("SELECT post_name FROM $wpdb->posts WHERE post_name = '$post_name' AND post_status = 'inherit' AND ID != '$post_ID' LIMIT 1");
if ($post_name_check) {
$suffix = 2;
while ($post_name_check) {
$alt_post_name = $post_name . "-$suffix";
$post_name_check = $wpdb->get_var("SELECT post_name FROM $wpdb->posts WHERE post_name = '$alt_post_name' AND post_status = 'inherit' AND ID != '$post_ID' AND post_parent = '$post_parent' LIMIT 1");
$suffix++;
}
$post_name = $alt_post_name;
}
if (empty($post_date))
$post_date = current_time('mysql');
if (empty($post_date_gmt))
$post_date_gmt = current_time('mysql', 1);
if ( empty($comment_status) ) {
if ( $update )
$comment_status = 'closed';
else
$comment_status = get_option('default_comment_status');
}
if ( empty($ping_status) )
$ping_status = get_option('default_ping_status');
if ( empty($post_pingback) )
$post_pingback = get_option('default_pingback_flag');
if ( isset($to_ping) )
$to_ping = preg_replace('|\s+|', "\n", $to_ping);
else
$to_ping = '';
if ( isset($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) )
$post_password = '';
if ( isset($to_ping) )
$to_ping = preg_replace('|\s+|', "\n", $to_ping);
else
$to_ping = '';
if ( ! isset($pinged) )
$pinged = '';
if ($update) {
$wpdb->query(
"UPDATE $wpdb->posts SET
post_author = '$post_author',
post_date = '$post_date',
post_date_gmt = '$post_date_gmt',
post_content = '$post_content',
post_content_filtered = '$post_content_filtered',
post_title = '$post_title',
post_excerpt = '$post_excerpt',
post_status = '$post_status',
post_type = '$post_type',
comment_status = '$comment_status',
ping_status = '$ping_status',
post_password = '$post_password',
post_name = '$post_name',
to_ping = '$to_ping',
pinged = '$pinged',
post_modified = '".current_time('mysql')."',
post_modified_gmt = '".current_time('mysql',1)."',
post_parent = '$post_parent',
menu_order = '$menu_order',
post_mime_type = '$post_mime_type',
guid = '$guid'
WHERE ID = $post_ID");
} else {
$wpdb->query(
"INSERT INTO $wpdb->posts
(post_author, post_date, post_date_gmt, post_content, post_content_filtered, post_title, post_excerpt, post_status, post_type, comment_status, ping_status, post_password, post_name, to_ping, pinged, post_modified, post_modified_gmt, post_parent, menu_order, post_mime_type, guid)
VALUES
('$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', '$post_date', '$post_date_gmt', '$post_parent', '$menu_order', '$post_mime_type', '$guid')");
$post_ID = (int) $wpdb->insert_id;
}
if ( empty($post_name) ) {
$post_name = sanitize_title($post_title, $post_ID);
$wpdb->query( "UPDATE $wpdb->posts SET post_name = '$post_name' WHERE ID = '$post_ID'" );
}
wp_set_post_categories($post_ID, $post_category);
if ( $file )
update_attached_file( $post_ID, $file );
clean_post_cache($post_ID);
if ( $update) {
do_action('edit_attachment', $post_ID);
} else {
do_action('add_attachment', $post_ID);
}
return $post_ID;
}
function wp_delete_attachment($postid) {
global $wpdb;
$postid = (int) $postid;
if ( !$post = $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE ID = '$postid'") )
return $post;
if ( 'attachment' != $post->post_type )
return false;
$meta = wp_get_attachment_metadata( $postid );
$file = get_attached_file( $postid );
$wpdb->query("DELETE FROM $wpdb->posts WHERE ID = '$postid'");
$wpdb->query("DELETE FROM $wpdb->comments WHERE comment_post_ID = '$postid'");
$wpdb->query("DELETE FROM $wpdb->post2cat WHERE post_id = '$postid'");
$wpdb->query("DELETE FROM $wpdb->postmeta WHERE post_id = '$postid'");
if ( ! empty($meta['thumb']) ) {
// Don't delete the thumb if another attachment uses it
if (! $wpdb->get_row("SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE '%".$wpdb->escape($meta['thumb'])."%' AND post_id <> $postid")) {
$thumbfile = str_replace(basename($file), $meta['thumb'], $file);
$thumbfile = apply_filters('wp_delete_file', $thumbfile);
@ unlink($thumbfile);
}
}
$file = apply_filters('wp_delete_file', $file);
if ( ! empty($file) )
@ unlink($file);
do_action('delete_attachment', $postid);
return $post;
}
function wp_get_attachment_metadata( $post_id, $unfiltered = false ) {
$post_id = (int) $post_id;
if ( !$post =& get_post( $post_id ) )
return false;
$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );
if ( $unfiltered )
return $data;
return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
}
function wp_update_attachment_metadata( $post_id, $data ) {
$post_id = (int) $post_id;
if ( !$post =& get_post( $post_id ) )
return false;
$old_data = wp_get_attachment_metadata( $post->ID, true );
$data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID );
if ( $old_data )
return update_post_meta( $post->ID, '_wp_attachment_metadata', $data, $old_data );
else
return add_post_meta( $post->ID, '_wp_attachment_metadata', $data );
}
function wp_get_attachment_url( $post_id = 0 ) {
$post_id = (int) $post_id;
if ( !$post =& get_post( $post_id ) )
return false;
$url = get_the_guid( $post->ID );
if ( 'attachment' != $post->post_type || !$url )
return false;
return apply_filters( 'wp_get_attachment_url', $url, $post->ID );
}
function wp_get_attachment_thumb_file( $post_id = 0 ) {
$post_id = (int) $post_id;
if ( !$post =& get_post( $post_id ) )
return false;
if ( !$imagedata = wp_get_attachment_metadata( $post->ID ) )
return false;
$file = get_attached_file( $post->ID );
if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) )
return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
return false;
}
function wp_get_attachment_thumb_url( $post_id = 0 ) {
$post_id = (int) $post_id;
if ( !$post =& get_post( $post_id ) )
return false;
if ( !$url = wp_get_attachment_url( $post->ID ) )
return false;
if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
return false;
$url = str_replace(basename($url), basename($thumb), $url);
return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
}
function wp_attachment_is_image( $post_id = 0 ) {
$post_id = (int) $post_id;
if ( !$post =& get_post( $post_id ) )
return false;
if ( !$file = get_attached_file( $post->ID ) )
return false;
$ext = preg_match('/\.([^.]+)$/', $file, $matches) ? strtolower($matches[1]) : false;
$image_exts = array('jpg', 'jpeg', 'gif', 'png');
if ( 'image/' == substr($post->post_mime_type, 0, 6) || $ext && 'import' == $post->post_mime_type && in_array($ext, $image_exts) )
return true;
return false;
}
function wp_mime_type_icon( $mime = 0 ) {
$post_id = 0;
if ( is_numeric($mime) ) {
$mime = (int) $mime;
if ( !$post =& get_post( $mime ) )
return false;
$post_id = (int) $post->ID;
$mime = $post->post_mime_type;
}
if ( empty($mime) )
return false;
$icon_dir = apply_filters( 'icon_dir', get_template_directory() . '/images' );
$icon_dir_uri = apply_filters( 'icon_dir_uri', get_template_directory_uri() . '/images' );
$types = array(
substr($mime, 0, strpos($mime, '/')),
substr($mime, strpos($mime, '/') + 1),
str_replace('/', '_', $mime)
);
$exts = array('jpg', 'gif', 'png');
$src = false;
foreach ( $types as $type ) {
foreach ( $exts as $ext ) {
$src_file = "$icon_dir/$type.$ext";
if ( file_exists($src_file) ) {
$src = "$icon_dir_uri/$type.$ext";
break 2;
}
}
}
return apply_filters( 'wp_mime_type_icon', $src, $mime, $post_id ); // Last arg is 0 if function pass mime type.
}
function wp_check_for_changed_slugs($post_id) {
if ( !strlen($_POST['wp-old-slug']) )
return $post_id;
$post = &get_post($post_id);
// we're only concerned with published posts
if ( $post->post_status != 'publish' || $post->post_type != 'post' )
return $post_id;
// only bother if the slug has changed
if ( $post->post_name == $_POST['wp-old-slug'] )
return $post_id;
$old_slugs = (array) get_post_meta($post_id, '_wp_old_slug');
// if we haven't added this old slug before, add it now
if ( !count($old_slugs) || !in_array($_POST['wp-old-slug'], $old_slugs) )
add_post_meta($post_id, '_wp_old_slug', $_POST['wp-old-slug']);
// if the new slug was used previously, delete it from the list
if ( in_array($post->post_name, $old_slugs) )
delete_post_meta($post_id, '_wp_old_slug', $post->post_name);
return $post_id;
}
?>
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