public static function getAllProvincesOptions()
 {
     $provinces = provinces::all();
     $output = "<option value = ''>Any province/City</option>";
     foreach ($provinces as $province) {
         $selected = "";
         if (isset($_POST['province'])) {
             if ($_POST['province'] == $province->province) {
                 $selected = " selected ";
             }
         }
         $output .= "<option {$selected} value = '{$province->province}'>{$province->province}</option>";
     }
     return $output;
 }