..versionadded::2.3

The Isbn constraint was introduced in Symfony 2.3.

..caution::

The ``isbn10`` and ``isbn13`` options are deprecated since Symfony 2.5

and will be removed in Symfony 3.0. Use the ``type`` option instead.

Furthermore, when using the ``type`` option, lowercase characters are no

longer supported starting in Symfony 2.5, as they are not allowed in ISBNs.

This constraint validates that an `International Standard Book Number (ISBN)`_

is either a valid ISBN-10,a valid ISBN-13 or both.

is either a valid ISBN-10 ora valid ISBN-13.

| Applies to|:ref:`property or method<validation-property-target>`|

| Options| - `isbn10`_|

|| - `isbn13`_|

| Options| - `type`_|

|| - `message`_|

|| - `isbn10Message`_|

|| - `isbn13Message`_|

|| - `bothIsbnMessage`_|

To use the ``Isbn`` validator, simply apply it to a property or method

on an object that will containa ISBN number.

on an object that will containan ISBN.

..configuration-block::

..code-block::php-annotations

Available Options

**type**: ``boolean``

**type**: ``string`` **default**: ``null``

If this required option is setto``true`` the constraint will check if the

code is a valid ISBN-10 code.

The type of ISBNtovalidate against.

Valid values are ``isbn10``, ``isbn13`` and ``null`` to accept any kind of ISBN.

**type**: ``boolean``

**type**: ``string`` **default**: ``null``

If this required option is set to ``true``theconstraint will check if the

code is a valid ISBN-13 code.

The message that will be shown ifthevalue is not valid.

If not ``null``, this message has priority over all the other messages.

isbn10Message

**type**: ``string`` **default**: ``This value is not a valid ISBN-10.``

The message that will be shown if the `isbn10`_ option istrue and the given

The message that will be shown if the `type`_ option is``isbn10`` and the given

value does not pass the ISBN-10 check.

isbn13Message

**type**: ``string`` **default**: ``This value is not a valid ISBN-13.``

The message that will be shown if the `isbn13`_ option istrue and the given

The message that will be shown if the `type`_ option is``isbn13`` and the given

value does not pass the ISBN-13 check.

bothIsbnMessage

**type**: ``string`` **default**: ``This value is neither a valid ISBN-10 nor a valid ISBN-13.``

The message that will be shown ifboththe `isbn10`_and `isbn13`_ options

are true and the givenvalue does not passthe ISBN-13 northe ISBN-13 check.

The message that will be shown if the `type`_option is ``null`` and the given

value does not passany ofthe ISBN checks.

.. _`International Standard Book Number (ISBN)`:http://en.wikipedia.org/wiki/Isbn