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Constraints
Exception
Mapping
Resources/translations
Tests
.gitattributes
.gitignore
CHANGELOG.md
ClassBasedInterface.php
Constraint.php
ConstraintValidator.php
ConstraintValidatorFactory.php
ConstraintValidatorFactoryInterface.php
ConstraintValidatorInterface.php
ConstraintViolation.php
ConstraintViolationInterface.php
ConstraintViolationList.php
ConstraintViolationListInterface.php
ExecutionContext.php
ExecutionContextInterface.php
GlobalExecutionContextInterface.php
GraphWalker.php
GroupSequenceProviderInterface.php
LICENSE
MetadataFactoryInterface.php
MetadataInterface.php
ObjectInitializerInterface.php
PropertyMetadataContainerInterface.php
PropertyMetadataInterface.php
README.md
Validation.php
ValidationVisitor.php
ValidationVisitorInterface.php
Validator.php
ValidatorBuilder.php
ValidatorBuilderInterface.php
ValidatorContext.php
ValidatorContextInterface.php
ValidatorFactory.php
ValidatorInterface.php
composer.json
phpunit.xml.dist

README.md

Validator Component

This component is based on the JSR-303 Bean Validation specification and enables specifying validation rules for classes using XML, YAML, PHP or annotations, which can then be checked against instances of these classes.

Usage

The component provides "validation constraints", which are simple objects containing the rules for the validation. Let's validate a simple string as an example:

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

$validator = Validation::createValidator();

$violations = $validator->validateValue('Bernhard', new Length(array('min' => 10)));

This validation will fail because the given string is shorter than ten characters. The precise errors, here called "constraint violations", are returned by the validator. You can analyze these or return them to the user. If the violation list is empty, validation succeeded.

Validation of arrays is possible using the Collection constraint:

use Symfony\Component\Validator\Validation;
use Symfony\Component\Validator\Constraints as Assert;

$validator = Validation::createValidator();

$constraint = new Assert\Collection(array(
    'name' => new Assert\Collection(array(
        'first_name' => new Assert\Length(array('min' => 101)),
        'last_name'  => new Assert\Length(array('min' => 1)),
    )),
    'email'    => new Assert\Email(),
    'simple'   => new Assert\Length(array('min' => 102)),
    'gender'   => new Assert\Choice(array(3, 4)),
    'file'     => new Assert\File(),
    'password' => new Assert\Length(array('min' => 60)),
));

$violations = $validator->validateValue($input, $constraint);

Again, the validator returns the list of violations.

Validation of objects is possible using "constraint mapping". With such a mapping you can put constraints onto properties and objects of classes. Whenever an object of this class is validated, its properties and method results are matched against the constraints.

use Symfony\Component\Validator\Validation;
use Symfony\Component\Validator\Constraints as Assert;

class User
{
    /**
     * @Assert\Length(min = 3)
     * @Assert\NotBlank
     */
    private $name;

    /**
     * @Assert\Email
     * @Assert\NotBlank
     */
    private $email;

    public function __construct($name, $email)
    {
        $this->name = $name;
        $this->email = $email;
    }

    /**
     * @Assert\True(message = "The user should have a Google Mail account")
     */
    public function isGmailUser()
    {
        return false !== strpos($this->email, '@gmail.com');
    }
}

$validator = Validation::createValidatorBuilder()
    ->enableAnnotationMapping()
    ->getValidator();

$user = new User('John Doe', 'john@example.com');

$violations = $validator->validate($user);

This example uses the annotation support of Doctrine Common to map constraints to properties and methods. You can also map constraints using XML, YAML or plain PHP, if you dislike annotations or don't want to include Doctrine. Check the documentation for more information about these drivers.

Resources

Silex integration:

https://github.com/fabpot/Silex/blob/master/src/Silex/Provider/ValidatorServiceProvider.php

Documentation:

http://symfony.com/doc/2.0/book/validation.html

JSR-303 Specification:

http://jcp.org/en/jsr/detail?id=303

You can run the unit tests with the following command:

$ cd path/to/Symfony/Component/Validator/
$ composer.phar install --dev
$ phpunit