Contributed by Jan Schädlich in #31351

The Type constraint included in the Validator component validates that a given value is of a specific data type. This type can be any of the valid PHP types, any of the PHP ctype functions (e.g. alnum, alpha, digit, etc.) and also the FQCN of any class:

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        // src/Entity/Author.php
namespace App\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    /**
     * @Assert\Type("Ramsey\Uuid\UuidInterface")
     */
    protected $id;

    /**
     * @Assert\Type("string")
     */
    protected $firstName;

    // ...
}
    

Starting from Symfony 4.4, the checked type can be an array of types, so you can validate that the given value type is one of several possible types. In the following example, the $accessCode property can contain only letters or only digits, but not both:

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        // src/Entity/Author.php
namespace App\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    // ...

    /**
     * @Assert\Type(type={"alpha", "digit"})
     */
    protected $accessCode;
}
    

Published in #Living on the edge

New in Symfony 4.4: Improved Type Constraint

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