Wordpress/wp-includes/meta.php

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<?php
/**
* Meta API
*
* Functions for retrieving and manipulating metadata
*
* @package WordPress
* @subpackage Meta
* @since 2.9.0
*/
function add_metadata($meta_type, $object_id, $meta_key, $meta_value, $unique = false) {
if ( !$meta_type || !$meta_key )
return false;
if ( ! $table = _get_meta_table($meta_type) )
return false;
global $wpdb;
$column = esc_sql($meta_type . '_id');
// expected_slashed ($meta_key)
$meta_key = stripslashes($meta_key);
if ( $unique && $wpdb->get_var( $wpdb->prepare(
"SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d",
$meta_key, $object_id ) ) )
return false;
$meta_value = maybe_serialize( stripslashes_deep($meta_value) );
$wpdb->insert( $table, array(
$column => $object_id,
'meta_key' => $meta_key,
'meta_value' => $meta_value
) );
wp_cache_delete($object_id, $meta_type . '_meta');
do_action( "added_{$meta_type}_meta", $wpdb->insert_id, $object_id, $meta_key, $meta_value );
return true;
}
function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_value = '') {
if ( !$meta_type || !$meta_key )
return false;
if ( ! $table = _get_meta_table($meta_type) )
return false;
global $wpdb;
$column = esc_sql($meta_type . '_id');
$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
// expected_slashed ($meta_key)
$meta_key = stripslashes($meta_key);
if ( ! $meta_id = $wpdb->get_var( $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) ) )
return add_metadata($meta_type, $object_id, $meta_key, $meta_value);
$meta_value = maybe_serialize( stripslashes_deep($meta_value) );
$data = compact( 'meta_value' );
$where = array( $column => $object_id, 'meta_key' => $meta_key );
if ( !empty( $prev_value ) ) {
$prev_value = maybe_serialize($prev_value);
$where['meta_value'] = $prev_value;
}
do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $meta_value );
$wpdb->update( $table, $data, $where );
wp_cache_delete($object_id, $meta_type . '_meta');
do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $meta_value );
return true;
}
function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false) {
if ( !$meta_type || !$meta_key || (!$delete_all && ! (int)$object_id) )
return false;
if ( ! $table = _get_meta_table($meta_type) )
return false;
global $wpdb;
$type_column = esc_sql($meta_type . '_id');
$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
// expected_slashed ($meta_key)
$meta_key = stripslashes($meta_key);
$meta_value = maybe_serialize( stripslashes_deep($meta_value) );
$query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key );
if ( !$delete_all )
$query .= $wpdb->prepare(" AND $type_column = %d", $object_id );
if ( $meta_value )
$query .= $wpdb->prepare(" AND meta_value = %s", $meta_value );
$meta_ids = $wpdb->get_col( $query );
if ( !count( $meta_ids ) )
return false;
$query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )";
$count = $wpdb->query($query);
if ( !$count )
return false;
wp_cache_delete($object_id, $meta_type . '_meta');
do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $meta_value );
return true;
}
function get_metadata($meta_type, $object_id, $meta_key = '', $single = false) {
if ( !$meta_type )
return false;
$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');
if ( !$meta_cache ) {
update_meta_cache($meta_type, $object_id);
$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');
}
if ( ! $meta_key )
return $meta_cache;
if ( isset($meta_cache[$meta_key]) ) {
if ( $single ) {
return maybe_unserialize( $meta_cache[$meta_key][0] );
} else {
return array_map('maybe_unserialize', $meta_cache[$meta_key]);
}
}
if ($single)
return '';
else
return array();
}
function update_meta_cache($meta_type, $object_ids) {
if ( empty( $meta_type ) || empty( $object_ids ) )
return false;
if ( ! $table = _get_meta_table($meta_type) )
return false;
$column = esc_sql($meta_type . '_id');
global $wpdb;
if ( !is_array($object_ids) ) {
$object_ids = preg_replace('|[^0-9,]|', '', $object_ids);
$object_ids = explode(',', $object_ids);
}
$object_ids = array_map('intval', $object_ids);
$cache_key = $meta_type . '_meta';
$ids = array();
foreach ( $object_ids as $id ) {
if ( false === wp_cache_get($id, $cache_key) )
$ids[] = $id;
}
if ( empty( $ids ) )
return false;
// Get meta info
$id_list = join(',', $ids);
$cache = array();
$meta_list = $wpdb->get_results( $wpdb->prepare("SELECT $column, meta_key, meta_value FROM $table WHERE $column IN ($id_list)",
$meta_type), ARRAY_A );
if ( !empty($meta_list) ) {
foreach ( $meta_list as $metarow) {
$mpid = intval($metarow[$column]);
$mkey = $metarow['meta_key'];
$mval = $metarow['meta_value'];
// Force subkeys to be array type:
if ( !isset($cache[$mpid]) || !is_array($cache[$mpid]) )
$cache[$mpid] = array();
if ( !isset($cache[$mpid][$mkey]) || !is_array($cache[$mpid][$mkey]) )
$cache[$mpid][$mkey] = array();
// Add a value to the current pid/key:
$cache[$mpid][$mkey][] = $mval;
}
}
foreach ( $ids as $id ) {
if ( ! isset($cache[$id]) )
$cache[$id] = array();
}
foreach ( array_keys($cache) as $object)
wp_cache_set($object, $cache[$object], $cache_key);
return $cache;
}
function _get_meta_table($type) {
global $wpdb;
$table_name = $type . 'meta';
if ( empty($wpdb->$table_name) )
return false;
return $wpdb->$table_name;
}
?>