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<?php
require CORE_PATH . 'extensions/event/hook.php';
 
class Event
{
    public static $data = null;
    protected static $_events = array();
    public static function has_handler($event)
    {
        return isset(self::$_events[$event]) && count(self::$_events[$event]);
    }
    public static function bind($event, $handler)
    {
        if(!isset(self::$_events[$event])) {
            self::$_events[$event] = array();
        }
        self::$_events[$event][] = $handler;
    }
    public static function before($event, $handler1, $handler2)
    {
        if(!isset(self::$_events[$event])) {
            self::$_events[$event] = array();
                }
        $i = array_search($handler, self::$_events[$event]);
        if($i===false) {
            self::$_events[$event][] = $handler2;
        } else {
            Util::array_insert(self::$_events[$event], $i, $handler2);
                }
    }
    public static function after($event, $handler1, $handler2)
    {
        if(!isset(self::$_events[$event])) {
            self::$_events[$event] = array();
                }
        $i = array_search($handler, self::$_events[$event]);
        if($i===false) {
            self::$_events[$event][] = $handler2;
        } else {
            Util::array_insert(self::$_events[$event], $i+1, $handler2);
                }
    }
    public static function unbind($event, $handler=false)
    {
        if($handler && isset(self::$_events[$event])) {
            $i = array_search($handler, self::$_events[$event]);
            if($i!==false)
                unset(self::$_events[$event][$i]);
        } else {
            self::$_events[$event] = array();
        }
    }
    public static function replace($event, $handler1, $handler2)
    {
        if(isset(self::$_events[$event])) {
            $i = array_search($handler1, self::$_events[$event]);
            if($i!==false) {
                self::$_events[$event][$i] = $handler2;
                return true;
            }
        }
        return false;        
    }
    public static function trigger($event, $args = array())
    {
        $value = false;
        if(isset(self::$_events[$event])) {
            foreach(self::$_events[$event] as $handler) {
                $value = call_user_func_array($handler, $args);
            }
        }
        
        self::$data = null;
        return $value;
    }
}

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