DB::disconnect PHP 메소드

    public static function disconnect()
    {
        $args = func_get_args();
        return call_user_func_array(array(DB::getMDB(), 'disconnect'), $args);
    }

 public function tearDown()
 {
     $this->beforeApplicationDestroyed(function () {
         DB::disconnect();
     });
     parent::tearDown();
 }