/**
* Get registered meta boxes via a filter.
* Advantages:
* - prevents duplicated global variables.
* - allows users to remove/hide registered meta boxes.
*/
public static function get_meta_boxes()
{
if (null === self::$meta_boxes) {
self::$meta_boxes = apply_filters('rwmb_meta_boxes', array());
self::$meta_boxes = empty(self::$meta_boxes) || !is_array(self::$meta_boxes) ? array() : self::$meta_boxes;
}
return self::$meta_boxes;
}
