Issn

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

Applies to	property or method
Class	Symfony\Component\Validator\Constraints\Issn
Validator	Symfony\Component\Validator\Constraints\IssnValidator

Basic Usage

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 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

New in version 5.2: The {{ label }} parameter was introduced in Symfony 5.2.

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.