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Validators

Isbn Validator

Laminas\Validator\Isbn allows you to validate ISBN-10 or ISBN-13 numbers.

Supported Options

The following options are supported for Laminas\Validator\Isbn:

  • type: Defines the allowed ISBN types. It defaults to Laminas\Validator\Isbn::AUTO. For details, take a look at the section on explicit types.

Basic Usage

A basic example of usage is below:

$validator = new Laminas\Validator\Isbn();

if ($validator->isValid($isbn)) {
    // isbn is valid
} else {
    // isbn is not valid
}

This will validate any ISBN-10 or ISBN-13 with or without separators.

Setting an Explicit ISBN Validation Type

An example of an ISBN type restriction follows:

use Laminas\Validator\Isbn;

$validator = new Isbn([ 'type' => Isbn::ISBN13]);

if ($validator->isValid($isbn)) {
    // this is a valid ISBN-13 value
} else {
    // this is an invalid ISBN-13 value
}

The above will validate only ISBN-13 values.

Valid types include:

  • Laminas\Validator\Isbn::AUTO (default)
  • Laminas\Validator\Isbn::ISBN10
  • Laminas\Validator\Isbn::ISBN13

About Separators

It is common for ISBN numbers to be formatted with either spaces or dash to make the numbers easier to read.

This validator strips and - prior to validation.

$validator = new Laminas\Validator\Isbn();

$validator->isValid('0060929871'); // true
$validator->isValid('0-06-092987-1'); // true
$validator->isValid('0 06 092987 1'); // true