在靜態類中新增動作 - init

 class sample{

     public static function add_action_func(){
         //note __CLASS__ will also include any namespacing
         add_action('init', array(__CLASS__, 'samp') );
     }

     public static function samp(){
         echo 'i did something';
     }
     
 }

 sample::add_action_func();