public function processAdviceValidation()
 {
     $return = true;
     $advices_to_validate = Advice::getIdsAdviceToValidate();
     $advices_to_unvalidate = Advice::getIdsAdviceToUnvalidate();
     foreach ($advices_to_validate as $id) {
         $advice = new Advice((int) $id);
         $advice->validated = 1;
         $return &= $advice->save();
     }
     foreach ($advices_to_unvalidate as $id) {
         $advice = new Advice((int) $id);
         $advice->validated = 0;
         $return &= $advice->save();
     }
     return $return;
 }