checking for double registration on the wiki

app/Http/Controllers/WikiController.php

@@ -38,6 +38,13 @@ class WikiController extends Controller
         $name = Auth::user()->name;
         $name = strtolower($name);
         $name = str_replace(' ', '_', $name);
+
+        //Check to see if the user is already registered in the database
+        $check = DB::select('SELECT login FROM wiki_user WHERE login = ?', [$name]);
+        if($check[0]->login === $name) {
+            return redirect('/dashboard')->with('error', 'Already registered for the wiki!');
+        }
+
         //Add the new user to the wiki
         $user->login = $name;
         $user->pass = $password;