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phpdoc for metadata API. Props wnorris. fixes #11943 

git-svn-id: http://svn.automattic.com/wordpress/trunk@12761 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
ryan 2010-01-19 17:08:04 +00:00
parent a06a4c6b70
commit 7e294fd282
1 changed files with 90 additions and 2 deletions
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92
wp-includes/meta.php
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@ -1,14 +1,33 @@
<?php
/**
* Meta API
* Metadata API
*
* Functions for retrieving and manipulating metadata
* 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 || !$meta_key )
return false;
@ -43,6 +62,25 @@ function add_metadata($meta_type, $object_id, $meta_key, $meta_value, $unique =
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 || !$meta_key )
return false;
@ -81,6 +119,24 @@ function update_metadata($meta_type, $object_id, $meta_key, $meta_value, $prev_v
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 || !$meta_key || (!$delete_all && ! (int)$object_id) )
return false;
@ -122,6 +178,19 @@ function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $d
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;
@ -150,6 +219,16 @@ function get_metadata($meta_type, $object_id, $meta_key = '', $single = false) {
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( $object_ids ) )
return false;
@ -212,6 +291,15 @@ function update_meta_cache($meta_type, $object_ids) {
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 $meta_type Type of object to get metadata table for (e.g., comment, post, or user)
* @return mixed Metadata table name, or false if no metadata table exists
*/
function _get_meta_table($type) {
global $wpdb;