/**
  * Add a pet to a user's PetBasket
  * @return boolean  true on successful insertion or false otherwise
  */
 public static function addToBasket()
 {
     $post = Core\Input::post();
     if (isset($post['userId']) && isset($post['petId'])) {
         $basket = new Basket($post['userId'], array());
         $res = $basket->addPet($post['petId']);
         $pet = Pet::constructById($post['petId']);
         $pet->loadImages();
         if ($res) {
             return json_encode(array('userId' => $post['userId'], 'pet' => $pet->__toString()));
         }
     }
     return false;
 }