Sphinx\SphinxClient::open PHP Method

    public function open()
    {
        if ($this->socket !== false) {
            $this->error = 'already connected';
            return false;
        }
        if (!($fp = $this->connect())) {
            return false;
        }
        // command, command version = 0, body length = 4, body = 1
        $req = pack('nnNN', self::SEARCHD_COMMAND_PERSIST, 0, 4, 1);
        if (!$this->send($fp, $req, 12)) {
            return false;
        }
        $this->socket = $fp;
        return true;
    }

 /**
  * {@inheritdoc}
  */
 public function open()
 {
     return $this->proxy->open();
 }