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  4. Constraints
  5. Luhn

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Read the updated version of this page for Symfony 5.3 (the current stable version).

Luhn

2.4 version
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4.4 5.3 current 5.4 dev 6.0
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Luhn

New in version 2.2: The Luhn constraint was introduced in Symfony 2.2.

This constraint is used to ensure that a credit card number passes the Luhn algorithm. It is useful as a first step to validating a credit card: before communicating with a payment gateway.

Applies to property or method
Options
Class Symfony\Component\Validator\Constraints\Luhn
Validator Symfony\Component\Validator\Constraints\LuhnValidator

Basic Usage

To use the Luhn validator, simply apply it to a property on an object that will contain a credit card number.

  • YAML
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    # src/Acme/SubscriptionBundle/Resources/config/validation.yml
Acme\SubscriptionBundle\Entity\Transaction:
    properties:
        cardNumber:
            - Luhn:
                message: Please check your credit card number.
  • Annotations
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    // src/Acme/SubscriptionBundle/Entity/Transaction.php
namespace Acme\SubscriptionBundle\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Transaction
{
    /**
     * @Assert\Luhn(message = "Please check your credit card number.")
     */
    protected $cardNumber;
}
  • XML
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    <!-- src/Acme/SubscriptionBundle/Resources/config/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="Acme\SubscriptionBundle\Entity\Transaction">
        <property name="cardNumber">
            <constraint name="Luhn">
                <option name="message">Please check your credit card number.</option>
            </constraint>
        </property>
    </class>
</constraint-mapping>
  • PHP
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    // src/Acme/SubscriptionBundle/Entity/Transaction.php
namespace Acme\SubscriptionBundle\Entity;

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

class Transaction
{
    protected $cardNumber;

    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addPropertyConstraint('cardNumber', new Assert\Luhn(array(
            'message' => 'Please check your credit card number',
        )));
    }
}

Available Options

message

type: string default: Invalid card number.

The default message supplied when the value does not pass the Luhn check.

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