addtimer error

[ghost]

ERROR zm_deactivate_swoole (ERROR 103): Fatal error: Call to undefined method swoole_server::addtimer() in **** on line 27

<?php
class TimerServer
{
	private $serv;
	public function __construct() {
		$this->serv = new swoole_server("0.0.0.0", 9501);
        $this->serv->set(array(
            'worker_num' => 8,
            'daemonize' => false,
            'max_request' => 10000,
            'dispatch_mode' => 2,
            'debug_mode'=> 1 ,
        ));
        $this->serv->on('WorkerStart', array($this, 'onWorkerStart'));
        $this->serv->on('Connect', array($this, 'onConnect'));
        $this->serv->on('Receive', array($this, 'onReceive'));
        $this->serv->on('Close', array($this, 'onClose'));
                // bind callback
        $this->serv->on('Timer', array($this, 'onTimer'));
        $this->serv->start();
	}
	public function onWorkerStart( $serv , $worker_id) {
		// 在Worker进程开启时绑定定时器
        echo "onWorkerStart\n";
        // 只有当worker_id为0时才添加定时器,避免重复添加
        if( $worker_id == 0 ) {
        	$serv->addtimer(100);
	        $serv->addtimer(500);
            $serv->addtimer(1000);
        }
    }
    public function onConnect( $serv, $fd, $from_id ) {
        echo "Client {$fd} connect\n";
    }
    public function onReceive( swoole_server $serv, $fd, $from_id, $data ) {
        echo "Get Message From Client {$fd}:{$data}\n";
    }
    public function onClose( $serv, $fd, $from_id ) {
        echo "Client {$fd} close connection\n";
    }
    public function onTimer($serv, $interval) {
    	switch( $interval ) {
    		case 500: {	// 
    			echo "Do Thing A at interval 500\n";
    			break;
    		}
    		case 1000:{
    			echo "Do Thing B at interval 1000\n";
    			break;
    		}
    		case 100:{
    			echo "Do Thing C at interval 100\n";
    			break;
    		}
    	}
    }
}
new TimerServer();