2020-05-02 / 2217阅 / 悠然
检查是否注册了元密钥。
(string)
(Required)
Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.
(string)
(Required)
Metadata key.
(string)
(Optional)
The subtype of the object type.
Default value: ''
(bool) True if the meta key is registered to the object type and, if provided, the object subtype. False if not.