register_meta()

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)
Meta key to register.

$args

(array)
(Required)
Data used to describe the meta key when registered.

• 'object_subtype'
  (string) A subtype; e.g. if the object type is "post", the post type. If left empty, the meta key will be registered>
  (string|array)
  (Optional)
  Deprecated. Use $args instead.

  Default value: null