函数原型
registered_meta_key_exists( string $object_type, string $meta_key, string $object_subtype = ” ): bool
函数描述
Checks if a meta key is registered.
是否弃用
未弃用
函数参数
-
$object_type
string
Required - Type of object metadata is for. Accepts
'post','comment','term','user', or any other object type with an associated meta table. -
$meta_key
string
Required - Metadata key.
-
$object_subtype
string
Optional - The subtype of the object type.
Default:
''
函数返回值
bool True if the meta key is registered to the object type and, if provided, the object subtype. False if not.
函数位置
File: wp-includes/meta.php.
函数源码
function registered_meta_key_exists( $object_type, $meta_key, $object_subtype = '' ) {
$meta_keys = get_registered_meta_keys( $object_type, $object_subtype );
return isset( $meta_keys[ $meta_key ] );
}
源码链接
变更日志
| Version | Description |
|---|---|
| 4.9.8 | The $object_subtype parameter was added. |
| 4.6.0 | Introduced. |
