325 lines
10 KiB
PHP
325 lines
10 KiB
PHP
<?php
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/**
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* Metadata API
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*
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* Functions for retrieving and manipulating metadata of various WordPress object types. Metadata
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* for an object is a represented by a simple key-value pair. Objects may contain multiple
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* metadata entries that share the same key and differ only in their value.
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*
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* @package WordPress
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* @subpackage Meta
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* @since 2.9.0
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*/
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/**
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* Add metadata for the specified object.
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*
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* @since 2.9.0
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* @uses $wpdb WordPress database object for queries.
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* @uses do_action() Calls 'added_{$meta_type}_meta' with meta_id of added metadata entry,
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* object ID, meta key, and meta value
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int $object_id ID of the object metadata is for
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* @param string $meta_key Metadata key
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* @param string $meta_value Metadata value
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* @param bool $unique Optional, default is false. Whether the specified metadata key should be
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* unique for the object. If true, and the object already has a value for the specified
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* metadata key, no change will be made
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* @return bool True on successful update, false on failure.
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*/
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function add_metadata($meta_type, $object_id, $meta_key, $meta_value, $unique = false) {
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if ( !$meta_type || !$meta_key )
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return false;
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if ( !$object_id = absint($object_id) )
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return false;
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if ( ! $table = _get_meta_table($meta_type) )
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return false;
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global $wpdb;
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$column = esc_sql($meta_type . '_id');
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// expected_slashed ($meta_key)
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$meta_key = stripslashes($meta_key);
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if ( $unique && $wpdb->get_var( $wpdb->prepare(
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"SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d",
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$meta_key, $object_id ) ) )
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return false;
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$meta_value = maybe_serialize( stripslashes_deep($meta_value) );
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$wpdb->insert( $table, array(
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$column => $object_id,
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'meta_key' => $meta_key,
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'meta_value' => $meta_value
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) );
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wp_cache_delete($object_id, $meta_type . '_meta');
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do_action( "added_{$meta_type}_meta", $wpdb->insert_id, $object_id, $meta_key, $meta_value );
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return true;
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}
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/**
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* Update metadata for the specified object. If no value already exists for the specified object
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* ID and metadata key, the metadata will be added.
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*
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* @since 2.9.0
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* @uses $wpdb WordPress database object for queries.
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* @uses do_action() Calls 'update_{$meta_type}_meta' before updating metadata with meta_id of
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* metadata entry to update, object ID, meta key, and meta value
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* @uses do_action() Calls 'updated_{$meta_type}_meta' after updating metadata with meta_id of
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* updated metadata entry, object ID, meta key, and meta value
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int $object_id ID of the object metadata is for
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* @param string $meta_key Metadata key
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* @param string $meta_value Metadata value
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* @param string $prev_value Optional. If specified, only update existing metadata entries with
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* the specified value. Otherwise, update all entries.
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* @return bool True on successful update, false on failure.
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*/
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function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_value = '') {
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if ( !$meta_type || !$meta_key )
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return false;
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if ( !$object_id = absint($object_id) )
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return false;
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if ( ! $table = _get_meta_table($meta_type) )
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return false;
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global $wpdb;
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$column = esc_sql($meta_type . '_id');
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$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
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// expected_slashed ($meta_key)
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$meta_key = stripslashes($meta_key);
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if ( ! $meta_id = $wpdb->get_var( $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s AND $column = %d", $meta_key, $object_id ) ) )
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return add_metadata($meta_type, $object_id, $meta_key, $meta_value);
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$meta_value = maybe_serialize( stripslashes_deep($meta_value) );
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$data = compact( 'meta_value' );
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$where = array( $column => $object_id, 'meta_key' => $meta_key );
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if ( !empty( $prev_value ) ) {
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$prev_value = maybe_serialize($prev_value);
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$where['meta_value'] = $prev_value;
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}
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do_action( "update_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $meta_value );
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$wpdb->update( $table, $data, $where );
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wp_cache_delete($object_id, $meta_type . '_meta');
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do_action( "updated_{$meta_type}_meta", $meta_id, $object_id, $meta_key, $meta_value );
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return true;
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}
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/**
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* Delete metadata for the specified object.
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*
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* @since 2.9.0
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* @uses $wpdb WordPress database object for queries.
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* @uses do_action() Calls 'deleted_{$meta_type}_meta' after deleting with meta_id of
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* deleted metadata entries, object ID, meta key, and meta value
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int $object_id ID of the object metadata is for
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* @param string $meta_key Metadata key
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* @param string $meta_value Optional. Metadata value. If specified, only delete metadata entries
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* with this value. Otherwise, delete all entries with the specified meta_key.
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* @param bool $delete_all Optional, default is false. If true, delete matching metadata entries
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* for all objects, ignoring the specified object_id. Otherwise, only delete matching
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* metadata entries for the specified object_id.
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* @return bool True on successful delete, false on failure.
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*/
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function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $delete_all = false) {
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if ( !$meta_type || !$meta_key )
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return false;
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if ( (!$object_id = absint($object_id)) && !$delete_all )
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return false;
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if ( ! $table = _get_meta_table($meta_type) )
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return false;
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global $wpdb;
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$type_column = esc_sql($meta_type . '_id');
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$id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id';
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// expected_slashed ($meta_key)
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$meta_key = stripslashes($meta_key);
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$meta_value = maybe_serialize( stripslashes_deep($meta_value) );
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$query = $wpdb->prepare( "SELECT $id_column FROM $table WHERE meta_key = %s", $meta_key );
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if ( !$delete_all )
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$query .= $wpdb->prepare(" AND $type_column = %d", $object_id );
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if ( $meta_value )
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$query .= $wpdb->prepare(" AND meta_value = %s", $meta_value );
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$meta_ids = $wpdb->get_col( $query );
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if ( !count( $meta_ids ) )
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return false;
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$query = "DELETE FROM $table WHERE $id_column IN( " . implode( ',', $meta_ids ) . " )";
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$count = $wpdb->query($query);
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if ( !$count )
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return false;
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wp_cache_delete($object_id, $meta_type . '_meta');
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do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $meta_value );
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return true;
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}
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/**
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* Retrieve metadata for the specified object.
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*
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* @since 2.9.0
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int $object_id ID of the object metadata is for
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* @param string $meta_key Optional. Metadata key. If not specified, retrieve all metadata for
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* the specified object.
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* @param bool $single Optional, default is false. If true, return only the first value of the
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* specified meta_key. This parameter has no effect if meta_key is not specified.
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* @return string|array Single metadata value, or array of values
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*/
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function get_metadata($meta_type, $object_id, $meta_key = '', $single = false) {
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if ( !$meta_type )
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return false;
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if ( !$object_id = absint($object_id) )
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return false;
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$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');
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if ( !$meta_cache ) {
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update_meta_cache($meta_type, $object_id);
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$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');
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}
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if ( ! $meta_key )
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return $meta_cache;
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if ( isset($meta_cache[$meta_key]) ) {
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if ( $single )
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return maybe_unserialize( $meta_cache[$meta_key][0] );
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else
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return array_map('maybe_unserialize', $meta_cache[$meta_key]);
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}
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if ($single)
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return '';
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else
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return array();
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}
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/**
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* Update the metadata cache for the specified objects.
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*
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* @since 2.9.0
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* @uses $wpdb WordPress database object for queries.
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*
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* @param string $meta_type Type of object metadata is for (e.g., comment, post, or user)
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* @param int|array $object_ids array or comma delimited list of object IDs to update cache for
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* @return mixed Metadata cache for the specified objects, or false on failure.
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*/
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function update_meta_cache($meta_type, $object_ids) {
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if ( empty( $meta_type ) || empty( $object_ids ) )
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return false;
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if ( ! $table = _get_meta_table($meta_type) )
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return false;
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$column = esc_sql($meta_type . '_id');
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global $wpdb;
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if ( !is_array($object_ids) ) {
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$object_ids = preg_replace('|[^0-9,]|', '', $object_ids);
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$object_ids = explode(',', $object_ids);
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}
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$object_ids = array_map('intval', $object_ids);
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$cache_key = $meta_type . '_meta';
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$ids = array();
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foreach ( $object_ids as $id ) {
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if ( false === wp_cache_get($id, $cache_key) )
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$ids[] = $id;
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}
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if ( empty( $ids ) )
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return false;
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// Get meta info
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$id_list = join(',', $ids);
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$cache = array();
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$meta_list = $wpdb->get_results( $wpdb->prepare("SELECT $column, meta_key, meta_value FROM $table WHERE $column IN ($id_list)",
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$meta_type), ARRAY_A );
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if ( !empty($meta_list) ) {
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foreach ( $meta_list as $metarow) {
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$mpid = intval($metarow[$column]);
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$mkey = $metarow['meta_key'];
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$mval = $metarow['meta_value'];
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// Force subkeys to be array type:
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if ( !isset($cache[$mpid]) || !is_array($cache[$mpid]) )
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$cache[$mpid] = array();
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if ( !isset($cache[$mpid][$mkey]) || !is_array($cache[$mpid][$mkey]) )
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$cache[$mpid][$mkey] = array();
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// Add a value to the current pid/key:
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$cache[$mpid][$mkey][] = $mval;
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}
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}
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foreach ( $ids as $id ) {
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if ( ! isset($cache[$id]) )
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$cache[$id] = array();
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}
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foreach ( array_keys($cache) as $object)
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wp_cache_set($object, $cache[$object], $cache_key);
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return $cache;
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}
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/**
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* Retrieve the name of the metadata table for the specified object type.
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*
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* @since 2.9.0
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* @uses $wpdb WordPress database object for queries.
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*
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* @param string $meta_type Type of object to get metadata table for (e.g., comment, post, or user)
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* @return mixed Metadata table name, or false if no metadata table exists
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*/
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function _get_meta_table($type) {
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global $wpdb;
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$table_name = $type . 'meta';
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if ( empty($wpdb->$table_name) )
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return false;
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return $wpdb->$table_name;
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}
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?>
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