Type

Validates that a value is of a specific data type. For example, if a variable should be an array, you can use this constraint with the array type option to validate this.

Applies to	property or method
Options	type message payload
Class	Type
Validator	TypeValidator

Basic Usage

This will check if firstName is of type string and that age is an integer.

Annotations
YAML
XML
PHP

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

use Symfony\Component\Validator\Constraints as Assert;

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

    /**
     * @Assert\Type(
     *     type="integer",
     *     message="The value {{ value }} is not a valid {{ type }}."
     * )
     */
    protected $age;
}
    

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        # config/validator/validation.yaml
App\Entity\Author:
    properties:
        firstName:
            - Type: string

        age:
            - Type:
                type: integer
                message: The value {{ value }} is not a valid {{ type }}.
    

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        <!-- config/validator/validation.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">

    <class name="App\Entity\Author">
        <property name="firstName">
            <constraint name="Type">
                <option name="type">string</option>
            </constraint>
        </property>
        <property name="age">
            <constraint name="Type">
                <option name="type">integer</option>
                <option name="message">The value {{ value }} is not a valid {{ type }}.</option>
            </constraint>
        </property>
    </class>
</constraint-mapping>
    

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

use Symfony\Component\Validator\Mapping\ClassMetadata;
use Symfony\Component\Validator\Constraints as Assert;

class Author
{
    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addPropertyConstraint('firstName', new Assert\Type('string'));

        $metadata->addPropertyConstraint('age', new Assert\Type([
            'type'    => 'integer',
            'message' => 'The value {{ value }} is not a valid {{ type }}.',
        ]));
    }
}
    

Options

type

type: string [default option]

This required option is the fully qualified class name or one of the PHP datatypes as determined by PHP's is_() functions.

Also, you can use ctype_() functions from corresponding built-in PHP extension. Consider a list of ctype functions:

Make sure that the proper locale is set before using one of these.

message

type: string default: This value should be of type {{ type }}.

The message if the underlying data is not of the given type.

You can use the following parameters in this message:

Parameter	Description
`{{ value }}`	The current (invalid) value
`{{ type }}`	The expected type

payload

type: mixed default: null

This option can be used to attach arbitrary domain-specific data to a constraint. The configured payload is not used by the Validator component, but its processing is completely up to you.

For example, you may want to use several error levels to present failed constraints differently in the front-end depending on the severity of the error.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.