Problem with the php-zmq

zmqproblem.php

<?php
class Checker
{
    private $host;
    private $port;
    private $context;
    private $poll;

    public function __construct($host = "localhost", $port = 10101)
    {  
        $this->host = $host;
        $this->port = $port;
        $this->context = new ZMQContext();
        $this->poll = new ZMQPoll();
    }

    public function check($ip, $service)
    {  
        $message = $service . '|' . $ip;
        try
        {  
            $sock = new ZMQSocket($this->context, ZMQ::SOCKET_REQ);
            $sock->connect('tcp://'.$this->host.':'.$this->port);
            $sock->send($message);
            $readable = array();
            $writeable = array();
            $sockId = $this->poll->add($sock, 1);
           
            $this->poll->poll($readable, $writeable, 1000);
            if(count($readable)<1)
            {  
                $this->poll->clear();
                throw new Exception("Server is too slow");
            }
            $result = intval($readable[0]->recv());
            $this->poll->clear();
        }
        catch (Exception $e)
        {  
            //print "Error: ".$e->getMessage() ."\n";
            return false;
        }
        if($result < 0)
            throw new Exception("malformed IP or service");
        return (bool)$result;
    }
}
$checker = new Checker();
var_dump($checker->check('someip', 'someservice'));