public function set($varName, $varValue, $keyId = 0)
 {
     $variable = Variable::firstOrCreate(['slug' => $varName]);
     if ($variable->set_permission_id > 0) {
         if ($keyId > 0) {
             $user = User::byKey($keyId);
             if (!$user->has($variable->set_permission)) {
                 return response("false", 500);
             } else {
                 $variable->value = $varValue;
                 $variable->save();
                 return response("true", 200);
             }
         }
         return response("false", 500);
     } else {
         $variable->value = $varValue;
         $variable->save();
         return response("true", 200);
     }
 }
 /**
  * Remove the specified resource from storage.
  *
  * @param  int  $id
  * @return \Illuminate\Http\Response
  */
 public function destroy(Variable $var)
 {
     $var->delete();
     return redirect()->back();
 }