Issn

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Validates that a value is a valid International Standard Serial Number (ISSN).

Applies to	property or method
Class	Issn
Validator	IssnValidator

Basic Usage

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

use Symfony\Component\Validator\Constraints as Assert;

class Journal
{
    #[Assert\Issn]
    protected string $issn;
}
    

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        # config/validator/validation.yaml
App\Entity\Journal:
    properties:
        issn:
            - Issn: ~
    

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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\Journal">
        <property name="issn">
            <constraint name="Issn"/>
        </property>
    </class>
</constraint-mapping>
    

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

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

class Journal
{
    // ...

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

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

`caseSensitive`

type: boolean default: false

The validator will allow ISSN values to end with a lower case 'x' by default. When switching this to true, the validator requires an upper case 'X'.

`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 ISSN.

The message shown if the given value is not a valid ISSN.

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.

`requireHyphen`

type: boolean default: false

The validator will allow non hyphenated ISSN values by default. When switching this to true, the validator requires a hyphenated ISSN value.

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

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