App\Http\Controllers\Controller::validate PHP Method

    public function validate(Request $request, array $rules, array $messages = [], array $customAttributes = [])
    {
        $validator = $this->getValidationFactory()->make($request->all(), $rules, $messages, $customAttributes);
        if ($validator->fails()) {
            if (Route::current()->getPrefix() === 'api') {
                $message = $validator->errors()->first();
                throw new ValidationException($message);
            } else {
                throw new ValidationException($this);
            }
        }
    }