PHP如何在被调用方法使用return时停止代码

Question

我做了一个main方法，它调用验证方法来检查一切是否正确。但是当验证方法发现问题并想要返回错误并将其显示给用户时，main方法将继续使用其余代码。你怎么能防止这种情况发生？这是我目前的代码：

public function postUpdateSettings(Request $request)
    {
        $this->validateSettings($request);

        $this->updateSettings($request);

        return redirect()->back()->with('succes', 'Your settings has been changed!');
    }

private function validateSettings(Request $request)
    {
        $this->validate($request, [
            'email' => 'required|string|email|max:255|unique:users,email,'.Auth::user()->id.'',
            'first_name' => 'required|string|max:50|alpha',
            'insertion' => 'nullable|max:25|alpha_spaces',
            'last_name' => 'required|string|max:50|alpha',
            'job' => 'required',
            'message' => 'nullable|max:500',
        ]);

        $jobs = $this->getJob();
        if(in_array($request->input('job'), $jobs) === false){
            return redirect()->route('home');
        }
    }