help with scrip

RouterOS Scripting
1

Hello, I would like to enable on bridge firewall through API. I have created PHP code, but is not working. Whats wrong?

      
      $API = new RouterosAPI();
      $API->debug = true;
      if ($API->connect($IP, $Username, $Pass, $Port))
	      {
                $API->write('/interface/bridge/settings/set');
                $API->write('=use-ip-firewall=yes');
                }
       $API->disconnect();