SessionHandlerInterface::write PHP Method

    public function write($session_id, $session_data);

 /**
  * {@inheritdoc}
  */
 public function write($sessionId, $sessionData)
 {
     if (isset($this->readSessions[$sessionId]) && $sessionData === $this->readSessions[$sessionId]) {
         return true;
     }
     return $this->wrappedSessionHandler->write($sessionId, $sessionData);
 }