add_metadata()

参数

$meta_type

(string)
(Required)
Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table.

$object_id

(int)
(Required)
ID of the object metadata is for.

$meta_key

(string)
(Required)
Metadata key.

$meta_value

(mixed)
(Required)
Metadata value. Must be serializable if non-scalar.

$unique

(bool)
(Optional)
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.

Default value: false