wiki/content/20201113172517-type_constraint.md

---
id: 942ca5cd-5ca6-4ec9-9dd6-652a0b791245
title: Type Constraint
---

# Description

Validates that a given value is of a specific type. This type can be any
of the valid PHP types[^1], any of the PHP ctype functions[^2] (e.g.
alnum, alpha, digit, etc.) and also the FQCN of any class

# Syntax

``` php
// 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;

    // ...
}
```

# Changelog

-   [Type Constraint Can Be An Array of
    Types](20201113172816-type_constraint_can_be_an_array_of_types)

# Footnotes

[^1]: <https://www.php.net/manual/en/language.types.intro.php>

[^2]: <https://php.net/ref.ctype>