Language

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Validates that a value is a valid language Unicode language identifier (e.g. fr or zh-Hant).

Applies to	property or method
Class	Language
Validator	LanguageValidator

Basic Usage

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

use Symfony\Component\Validator\Constraints as Assert;

class User
{
    #[Assert\Language]
    protected string $preferredLanguage;
}
    

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        # config/validator/validation.yaml
App\Entity\User:
    properties:
        preferredLanguage:
            - Language: ~
    

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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 https://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">

    <class name="App\Entity\User">
        <property name="preferredLanguage">
            <constraint name="Language"/>
        </property>
    </class>
</constraint-mapping>
    

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

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

class User
{
    // ...

    public static function loadValidatorMetadata(ClassMetadata $metadata): void
    {
        $metadata->addPropertyConstraint('preferredLanguage', new Assert\Language());
    }
}
    

Note

As with most of the other constraints, null and empty strings are considered valid values. This is to allow them to be optional values. If the value is mandatory, a common solution is to combine this constraint with NotBlank.

Options

alpha3

type: boolean default: false

If this option is true, the constraint checks that the value is a ISO 639-2 (2T) three-letter code (e.g. French = fra) instead of the default ISO 639-1 two-letter code (e.g. French = fr).

`groups`

type: array | string default: null

It defines the validation group or groups of this constraint. Read more about validation groups.

`message`

type: string default: This value is not a valid language.

This message is shown if the string is not a valid language code.

You can use the following parameters in this message:

Parameter	Description
`{{ value }}`	The current (invalid) value
`{{ label }}`	Corresponding form field label

`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.

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