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

0

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

• Symfony Validator Component
• Validation Constraints

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