RegisterEventAutoload.php

<?php 

class RegisterEventAutoload{
    /**
     * [handler on start classe events
     * @return [type] [description]
     */
    public function handler(){
       
       $ci  = get_instance();
       	$ci->load->config('register_events', true);
        $registered = config_item('register_events');
        if(! $registered) return;
        $this->registerAllEvents($registered);
         
       
    }
    /**
     * [registerAllEvents description]
     * @param  [type] $events [description]
     * @return [type]         [description]
     */
    private function registerAllEvents($events){
          
          foreach ($events as $key => $ev) {
          	         foreach ($ev as  $classEvent) {
          	         	    if(!is_object($classEvent))
          	         	    	 $classEvent = new $classEvent();
          	         	     Events::register($key , [$classEvent , 'handler']);	 
          	         }
          	   
          }
    }
}
//** hooks/RegisterEventAutoload.php