I am trying to add validation constraints on the registration of a new user and I want the combination of two fields be unique in the database. The error that i get is from the database saying i have a integrity constraint violation. the table I have is called users and the fields i want to have unique combination are called ssn and lastfour.

I added the line $table->unique(array('ssn','lastfour')); in the user migration and I also added some fields in the registration which work fine and the database is ok. I tried the solution in a similar question posted about 9 months ago [Laravel unique validation on multiple columns](https://stackoverflow.com/questions/50349775/laravel-unique-validation-on-multiple-columns?fbclid=IwAR11pAX9BfNsEpLBfXGb3YtDFgO9NzYD055fxg5o037eMu3xLznedQLcH5Y) but i get undefined variable on line "Rule::unique('servers')->where(function ($query) use($ssn,$lastfour)"

```
protected function validator(array $data)
{
    return Validator::make($data, [
        'name' => ['required', 'string', 'max:255'],
        'lastname' => ['required', 'string', 'max:255'],
        'username' => ['required', 'string', 'max:255', 'unique:users'],
        'ssn' => ['required', 'string', 'regex:/^[0-9]*$/','max:8', 'min:8'],
        'lastfour' => ['required', 'string', 'regex:/^[0-9]*$/','max:4', 'min:4'],
        'email' => ['required', 'string', 'email', 'max:255', 'unique:users'],
        'password' => ['required', 'string', 'min:6', 'confirmed'],
    ]);
}

```

i tried the following code

```
'lastfour' => ['required', 'string', 'regex:/^[0-9]*$/','max:4', 'min:4', 
                        Rule::unique('users')->where(function ($query) use 
                        ($ssn, $lastfour){
                            return $query->where('ssn', $ssn)
                            ->where('lastfour', $lastfour);
                        })
        ],

```