Swift_Transport_AbstractSmtpTransport::executeCommand PHP Method

    public function executeCommand($command, $codes = array(), &$failures = null)
    {
        $failures = (array) $failures;
        $seq = $this->_buffer->write($command);
        $response = $this->_getFullResponse($seq);
        if ($evt = $this->_eventDispatcher->createCommandEvent($this, $command, $codes)) {
            $this->_eventDispatcher->dispatchEvent($evt, 'commandSent');
        }
        $this->_assertResponseCode($response, $codes);
        return $response;
    }

 /**
  * Run a command against the buffer, expecting the given response codes.
  *
  * If no response codes are given, the response will not be validated.
  * If codes are given, an exception will be thrown on an invalid response.
  *
  * @param string   $command
  * @param int[]    $codes
  * @param string[] $failures An array of failures by-reference
  *
  * @return string
  */
 public function executeCommand($command, $codes = array(), &$failures = null)
 {
     $failures = (array) $failures;
     $stopSignal = false;
     $response = null;
     foreach ($this->_getActiveHandlers() as $handler) {
         $response = $handler->onCommand($this, $command, $codes, $failures, $stopSignal);
         if ($stopSignal) {
             return $response;
         }
     }
     return parent::executeCommand($command, $codes, $failures);
 }