Validation plays an essential role in modern applications. When talking about web applications, we can say we differentiate between two main types of validation; form data and persisted data validation. Taking input from a user via a web form should be validated, the same as any persisting data that goes into a database.
Symfony excels here by providing a Validation component based on JSR 303 Bean Validation drafted and available at http://beanvalidation.org/1.0/spec/. If we look back at our app/config/config.yml, under the framework root element, we can see that the validation service is turned on by default:
framework:
validation:{ enable_annotations: true }We can access the validation service from any controller class by simply calling it via the $this->get('validator') expression, as shown in the following example:
$customer = new Customer();
$validator = $this->get('validator');
$errors = $validator->validate($customer);
if (count($errors) > 0) {
// Handle...