php - Laravel - make json - add to variable new objects -

i have function max-offers maxoffers table:

public function maxoffers($id)     {          $offers = maxoffer::where('article_id', $id)->latest()->get(['id', 'price', 'start', 'user_id']);          return $offers;     } 

and this:

[{"id":121,"price":67,"start":"sat, 23 apr 2016 00:00:00 +0000","user_id":8},{"id":114,"price":45,"start":"sun, 08 may 2016 00:00:00 +0000","user_id":9},{"id":113,"price":53,"start":"sun, 24 apr 2016 00:00:00 +0000","user_id":8},{"id":111,"price":55,"start":"wed, 01 jun 2016 00:00:00 +0000","user_id":11},{"id":110,"price":53,"start":"fri, 03 jun 2016 00:00:00 +0000","user_id":8},{"id":107,"price":53,"start":"wed, 03 aug 2016 00:00:00 +0000","user_id":8},{"id":106,"price":53,"start":"mon, 01 aug 2016 00:00:00 +0000","user_id":8},{"id":105,"price":53,"start":"tue, 16 aug 2016 00:00:00 +0000","user_id":8},{"id":104,"price":55,"start":"thu, 21 apr 2016 00:00:00 +0000","user_id":11},{"id":101,"price":57,"start":"wed, 17 aug 2016 00:00:00 +0000","user_id":8}] 

now have alse: $start = 'sun, 03 apr 2016 00:00:00'; $end = 'sat, 23 sep 2016 00:00:00';

how can go day day throuth $offers $start date $end date , if there no date day add $offers new object data:

{"title":,"price":100,"start":"date_which_not_excist into_offers","user_id":8} 

so how can go throuth $offers , if there not date in period $start $end add new object json?

i haven't performed following code yet wanted this.

try this:

 public function maxoffers($id)     {          $start_date = ;         $end_date = ;          $offers = maxoffer::where('article_id', $id)                             ->where('start', '>=', $start_date)                             ->where('start', '<=', $end_date)                             ->get(['id', 'price', 'start', 'user_id']);          $start_date = 'sun, 03 apr 2016 00:00:00';          $end_date = 'sat, 23 sep 2016 00:00:00';          while (strtotime($start_date) <= strtotime($end_date)) {              $start_date = date ("y-m-d", strtotime("+1 day", strtotime($start_date)));              $count = 0;              foreach($offers $offer) {                 if(strtotime($offer->start) == strtotime($start_date)) {                     $count++;                 }             }              if($count == 0) {                 maxoffer::create(['title' => null, 'price' => '100', 'start' => $start_date, 'user_id' => 8 ]);                }          }          // code update $offers variable before return          return $offers;     }