9951 explained code solutions for 126 technologies

php-symfonyHow to do validation in PHP Symfony?

Validation in PHP Symfony can be done using the Validator component. It provides a set of constraints which can be used to validate data.

Example code

use Symfony\Component\Validator\Validation;
use Symfony\Component\Validator\Constraints\Length;

$validator = Validation::createValidator();
$violations = $validator->validate('abcde', [
    new Length(['min' => 3, 'max' => 5]),

echo count($violations);

Output example


Code explanation

  • use Symfony\Component\Validator\Validation; - imports the Validation class from the Validator component
  • use Symfony\Component\Validator\Constraints\Length; - imports the Length constraint from the Validator component
  • $validator = Validation::createValidator(); - creates a validator instance
  • $violations = $validator->validate('abcde', [new Length(['min' => 3, 'max' => 5]),]); - validates the string 'abcde' against the Length constraint with min and max values
  • echo count($violations); - prints the number of violations

Helpful links

Edit this code on GitHub