README

Adds postal code validation to Laravel, based on Google's libaddressinput.

• Requirements
• Installation
• Usage
  • Available rules
  • Fluent API
  • Adding an error message
  • Manually validating
  • Overriding rules
• License
• Attribution

Requirements

This package has the following requirements:

• PHP 8.2 or greater
• Laravel 12 or greater

Installation

You can install this package with Composer, by running the command below:

composer require axlon/laravel-postal-code-validation

If you have package discovery enabled, that's it, continue to the usage section. If you want to register the package manually, you can do this by adding the following line to your config/app.php file:

'providers' => [
   ...
   Axlon\PostalCodeValidation\ValidationServiceProvider::class,
   ...
],

Usage

Postal code validation perfectly integrates into your Laravel application, you can use it just like you would any framework validation rule.

Available rules

This package adds the following validation rules:

postal_code:foo,bar,...

The field under validation must be a valid postal code in at least one of the given countries. Arguments must be countries in ISO 3166-1 alpha-2 format.

'postal_code' => 'postal_code:NL,DE,FR,BE'

postal_code_with:foo,bar,...

The field under validation must be a postal code in at least one of the countries in the given fields only if at least one of the specified fields is present.

'billing.country' => 'required|string|max:2',
...
'shipping.country' => 'nullable|string|max:2',
'shipping.postal_code' => 'postal_code_with:billing.country,shipping.country'

Fluent API

If you prefer using a fluent object style over string based rules, that's also available:

'postal_code' => [
    PostalCode::for('NL')->or('BE'),
],

The same goes for the postal_code_with rule:

'billing.country' => 'required|string|max:2',
...
'shipping.country' => 'nullable|string|max:2',
'shipping.postal_code' => [
    PostalCode::with('billing.country')->or('shipping.country')
],

Adding an error message

To add a meaningful error message, add the following lines to resources/lang/{your language}/validation.php:

'postal_code' => 'Your message here',
'postal_code_with' => 'Your message here',

The following placeholders will be automatically filled for you:

*The :countries and :examples placeholders may be empty if no valid countries are passed.

Manually validating

If you want to validate postal codes manually outside of Laravel's validation system, you can call the validator directly, like so:

PostalCodes::passes($country, $postalCode); // returns a boolean

Overriding rules

Depending on your use case you may want to override the patterns used to validate postal codes for a country. You can do this by adding the code below in a central place in your application (e.g. a service provider):

PostalCodes::override('country', '/your pattern/');

// You can also pass overrides as an array

PostalCodes::override([
    'country 1' => '/pattern 1/',
    'country 2' => '/pattern 2/',
]);

Important: If you believe there is a bug in one of the patterns that this package ships with, please create an issue in the issue tracker.

License

This software is licenced under the MIT license.

Attribution

This software contains data derived from Google's Address Validation Metadata. The original data is provided by Google and is licensed under the CC-BY 4.0 license.

Modifications

• Only data relevant to postal code validation is included
• Regular expressions found in the data are adjusted to be compatible with PHP's regex engine
• The resulting data is converted into PHP resource files