/**
  * Display one or multiple newcomer's letter
  *
  * @param  int $id
  * @param  int $limit
  * @param  string $category
  * @return Response
  */
 public function letter($id, $limit = null, $category = null)
 {
     if ($limit === null) {
         $newcomers = [Newcomer::findOrFail($id)];
     } elseif ($category != null) {
         $newcomers = Newcomer::where('branch', '=', strtoupper($category))->offset($id)->limit($limit)->get();
     } else {
         $newcomers = Newcomer::offset($id)->limit($limit)->get();
     }
     // Parse phone number and save it to db
     foreach ($newcomers as $newcomer) {
         if (isset($newcomer->referral->phone)) {
             if (preg_match('/^(?:0([0-9])|(?:00|\\+)33[\\. -]?([0-9]))[\\. -]?([0-9]{2})[\\. -]?([0-9]{2})[\\. -]?([0-9]{2})[\\. -]?([0-9]{2})[\\. -]?$/', $newcomer->referral->phone, $m) && $newcomer->referral->phone != '0' . $m[1] . $m[2] . '.' . $m[3] . '.' . $m[4] . '.' . $m[5] . '.' . $m[6]) {
                 $referral = $newcomer->referral;
                 $referral->phone = '0' . $m[1] . $m[2] . '.' . $m[3] . '.' . $m[4] . '.' . $m[5] . '.' . $m[6];
                 $referral->save();
             }
         }
     }
     return View::make('dashboard.newcomers.letter', ['newcomers' => $newcomers, 'i' => $id, 'count' => Newcomer::count()]);
 }