laravel how to validate as equal to a variable

in laravel validation (registering) i want to compare one of the fields with a php variable (it should be equal with that)

how can i do this?

protected function validator(array $data)
{

    return Validator::make($data, [
        'name' => 'required|max:255',
        'phone' => 'required|min:10|max:11|unique:users',
        'email' => 'required|email|max:255',
        'password' => 'required',
        'password_confirmation' => 'required',
        'user_captcha' => 'required'
    ]);
}

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