Language
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.