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get_post_custom_keys › WordPress Function

Since1.2.0
已弃用n/a
› get_post_custom_keys ( $post_id = 0 )
参数:
  • (int) $post_id Optional. Post ID. Default is the ID of the global `$post`.
    Required: No
    默认: —
返回:
  • (array|void) Array of the keys, if retrieved.
定义在:
文档:

Retrieves meta field names for a post.

If there are no meta fields, then nothing (null) will be returned.


Related Functions: get_post_custom, get_post_custom_values, get_post_ancestors, get_post_states, get_post_time

源码 

function get_post_custom_keys( $post_id = 0 ) {
	$custom = get_post_custom( $post_id );

	if ( ! is_array( $custom ) ) {
		return;
	}

	$keys = array_keys( $custom );
	if ( $keys ) {
		return $keys;
	}
}