registered_meta_key_exists
函数
registered_meta_key_exists ( $object_type, $meta_key, $object_subtype = '' )
- 参数
-
-
(string)
$object_type
Type of object metadata is for. Accepts ‘post’, ‘comment’, ‘term’, ‘user’, or any other object type with an associated meta table.- Required: 是
-
(string)
$meta_key
Metadata key.- Required: 是
-
(string)
$object_subtype
Optional. The subtype of the object type.- Required: 否
- Default: (empty)
-
(string)
- 返回值
-
- (bool) True if the meta key is registered to the object type and, if provided, the object subtype. False if not.
- 定义位置
-
-
wp-includes/meta.php
, line 1587
-
wp-includes/meta.php
- 引入
- 4.6.0
- 弃用
- –
Checks if a meta key is registered.
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 ] ); }
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