fc73604019
git-svn-id: https://develop.svn.wordpress.org/trunk@15917 602fd350-edb4-49c9-b593-d223f7449a82
349 lines
11 KiB
PHP
349 lines
11 KiB
PHP
<?php
|
|
/**
|
|
* Metadata API
|
|
*
|
|
* Functions for retrieving and manipulating metadata of various WordPress object types. Metadata
|
|
* for an object is a represented by a simple key-value pair. Objects may contain multiple
|
|
* metadata entries that share the same key and differ only in their value.
|
|
*
|
|
* @package WordPress
|
|
* @subpackage Meta
|
|
* @since 2.9.0
|
|
*/
|
|
|
|
/**
|
|
* Add metadata for the specified object.
|
|
*
|
|
* @since 2.9.0
|
|
* @uses $wpdb WordPress database object for queries.
|
|
* @uses do_action() Calls 'added_{$meta_type}_meta' with meta_id of added metadata entry,
|
|
* object ID, meta key, and meta value
|
|
*
|
|
* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
|
|
* @param int $object_id ID of the object metadata is for
|
|
* @param string $meta_key Metadata key
|
|
* @param string $meta_value Metadata value
|
|
* @param bool $unique Optional, default is false. Whether the specified metadata key should be
|
|
* unique for the object. If true, and the object already has a value for the specified
|
|
* metadata key, no change will be made
|
|
* @return bool True on successful update, false on failure.
|
|
*/
|
|
function add_metadata($meta_type, $object_id, $meta_key, $meta_value, $unique = false) {
|
|
if ( !$meta_type || !$meta_key )
|
|
return false;
|
|
|
|
if ( !$object_id = absint($object_id) )
|
|
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 = $meta_value;
|
|
$meta_value = maybe_serialize( stripslashes_deep($meta_value) );
|
|
|
|
do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_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');
|
|
// users cache stores usermeta that must be cleared.
|
|
if ( 'user' == $meta_type )
|
|
clean_user_cache($object_id);
|
|
|
|
do_action( "added_{$meta_type}_meta", $wpdb->insert_id, $object_id, $meta_key, $_meta_value );
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Update metadata for the specified object. If no value already exists for the specified object
|
|
* ID and metadata key, the metadata will be added.
|
|
*
|
|
* @since 2.9.0
|
|
* @uses $wpdb WordPress database object for queries.
|
|
* @uses do_action() Calls 'update_{$meta_type}_meta' before updating metadata with meta_id of
|
|
* metadata entry to update, object ID, meta key, and meta value
|
|
* @uses do_action() Calls 'updated_{$meta_type}_meta' after updating metadata with meta_id of
|
|
* updated metadata entry, object ID, meta key, and meta value
|
|
*
|
|
* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
|
|
* @param int $object_id ID of the object metadata is for
|
|
* @param string $meta_key Metadata key
|
|
* @param string $meta_value Metadata value
|
|
* @param string $prev_value Optional. If specified, only update existing metadata entries with
|
|
* the specified value. Otherwise, update all entries.
|
|
* @return bool True on successful update, false on failure.
|
|
*/
|
|
function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_value = '') {
|
|
if ( !$meta_type || !$meta_key )
|
|
return false;
|
|
|
|
if ( !$object_id = absint($object_id) )
|
|
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, $meta_value);
|
|
|
|
// Compare existing value to new value if no prev value given and the key exists only once.
|
|
if ( empty($prev_value) ) {
|
|
$old_value = get_metadata($meta_type, $object_id, $meta_key);
|
|
if ( count($old_value) == 1 ) {
|
|
if ( $old_value[0] === $meta_value )
|
|
return false;
|
|
}
|
|
}
|
|
|
|
$_meta_value = $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');
|
|
// users cache stores usermeta that must be cleared.
|
|
if ( 'user' == $meta_type )
|
|
clean_user_cache($object_id);
|
|
|
|
do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $_meta_value );
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Delete metadata for the specified object.
|
|
*
|
|
* @since 2.9.0
|
|
* @uses $wpdb WordPress database object for queries.
|
|
* @uses do_action() Calls 'deleted_{$meta_type}_meta' after deleting with meta_id of
|
|
* deleted metadata entries, object ID, meta key, and meta value
|
|
*
|
|
* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
|
|
* @param int $object_id ID of the object metadata is for
|
|
* @param string $meta_key Metadata key
|
|
* @param string $meta_value Optional. Metadata value. If specified, only delete metadata entries
|
|
* with this value. Otherwise, delete all entries with the specified meta_key.
|
|
* @param bool $delete_all Optional, default is false. If true, delete matching metadata entries
|
|
* for all objects, ignoring the specified object_id. Otherwise, only delete matching
|
|
* metadata entries for the specified object_id.
|
|
* @return bool True on successful delete, false on failure.
|
|
*/
|
|
function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false) {
|
|
if ( !$meta_type || !$meta_key )
|
|
return false;
|
|
|
|
if ( (!$object_id = absint($object_id)) && !$delete_all )
|
|
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( $meta_ids ) )
|
|
return false;
|
|
|
|
do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $meta_value );
|
|
|
|
$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');
|
|
// users cache stores usermeta that must be cleared.
|
|
if ( 'user' == $meta_type )
|
|
clean_user_cache($object_id);
|
|
|
|
do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $meta_value );
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Retrieve metadata for the specified object.
|
|
*
|
|
* @since 2.9.0
|
|
*
|
|
* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
|
|
* @param int $object_id ID of the object metadata is for
|
|
* @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
|
|
* the specified object.
|
|
* @param bool $single Optional, default is false. If true, return only the first value of the
|
|
* specified meta_key. This parameter has no effect if meta_key is not specified.
|
|
* @return string|array Single metadata value, or array of values
|
|
*/
|
|
function get_metadata($meta_type, $object_id, $meta_key = '', $single = false) {
|
|
if ( !$meta_type )
|
|
return false;
|
|
|
|
if ( !$object_id = absint($object_id) )
|
|
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();
|
|
}
|
|
|
|
/**
|
|
* Update the metadata cache for the specified objects.
|
|
*
|
|
* @since 2.9.0
|
|
* @uses $wpdb WordPress database object for queries.
|
|
*
|
|
* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
|
|
* @param int|array $object_ids array or comma delimited list of object IDs to update cache for
|
|
* @return mixed Metadata cache for the specified objects, or false on failure.
|
|
*/
|
|
function update_meta_cache($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;
|
|
}
|
|
|
|
/**
|
|
* Retrieve the name of the metadata table for the specified object type.
|
|
*
|
|
* @since 2.9.0
|
|
* @uses $wpdb WordPress database object for queries.
|
|
*
|
|
* @param string $type Type of object to get metadata table for (e.g., comment, post, or user)
|
|
* @return mixed Metadata table name, or false if no metadata table exists
|
|
*/
|
|
function _get_meta_table($type) {
|
|
global $wpdb;
|
|
|
|
$table_name = $type . 'meta';
|
|
|
|
if ( empty($wpdb->$table_name) )
|
|
return false;
|
|
|
|
return $wpdb->$table_name;
|
|
}
|
|
?>
|