Laravel 5.2 validation check if value is not equal to a variable

In my instance one user is inviting another I would like to check if the user they are inviting is not themselves.

Thus I have two variables incomming email and user->email

$this->validate($request, [
            'email' => 'required|email',
        ]);

How can I add that validation rule to the validation call?


正确答案 

In my instance one user is inviting another I would like to check if the user they are inviting is not themselves.

Thus I have two variables incomming email and user->email

$this->validate($request, [
            'email' => 'required|email',
        ]);

How can I add that validation rule to the validation call?