postbox_classes
postbox_classes ( $box_id, $screen_id )
Parameters:- (string) box_id Meta box ID (used in the 'id' attribute for the meta box).
- (string) screen_id The screen on which the meta box is shown.
Returns:- (string) Space-separated string of class names.
Defined at: - Introduced in WordPress: 2.5.0
- Deprecated in WordPress: —
Description
Returns the list of classes to be used by a meta box.