symfony3 Validation
Remarks
In fact, form validation is based from a component, named "Validator Component".
You can often use the dedicated service if you did't have to show a form in a template. Like APIs. You may validate datas in the same way, like this :
For example, based on symfony doc :
$validator = $this->get('validator');
$errors = $validator->validate($author);
if (count($errors) > 0) {
/*
* Uses a __toString method on the $errors variable which is a
* ConstraintViolationList object. This gives us a nice string
* for debugging.
*/
$errorsString = (string) $errors;
}
