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get_post_custom_keys › WordPress Function

Since1.2.0
Deprecatedn/a
› get_post_custom_keys ( $post_id = 0 )
Parameters:
  • (int) $post_id Optional. Post ID. Default is the ID of the global `$post`.
    Required: No
    Default: —
Returns:
  • ((string|int)[]|null) Array of the meta field keys, if retrieved. Null if the post has no
    post meta, or if the post meta could not be retrieved. A key which is
    a numeric string is returned as the equivalent integer.
Defined at:
Codex:

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

Source 

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

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

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