Issn

Issn

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

Basic Usage

• Annotations

  // src/Entity/Journal.php
  namespace App\Entity;
  use Symfony\Component\Validator\Constraints as Assert;
  class Journal
  {
      /**
       * @Assert\Issn
       */
      protected $issn;
  }

• YAML

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

• XML

  <!-- 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>

• PHP

  // 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)
      {
          $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

It defines the validation group or groups this constraint belongs to. 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:

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.