goodcat/laravel-l10n

An opinionated Laravel package for app localization

v0.1.1 2025-09-01 14:17 UTC

Requires

• php: ^8.2
• illuminate/http: ^11.0|^12.0
• illuminate/routing: ^11.0|^12.0
• illuminate/support: ^11.0|^12.0

Requires (Dev)

• larastan/larastan: ^3.5
• laravel/pint: ^1.22
• orchestra/testbench: ^10.4
• pestphp/pest: ^3.8

MIT

• Matteo Palazzo

• l10n
• laravel
• localization
• goodcat

README

An opinionated Laravel package for app localization.

Quickstart

Get started with laravel-l10n in three steps.

1. Download the package via Composer.

   composer require goodcat/laravel-l10n

2. Add the locale middlewares to your bootstrap/app.php file.

   return Application::configure(basePath: dirname(__DIR__))
       ->withMiddleware(function (Middleware $middleware): void {
           $middleware->web(prepend: [
               \Goodcat\L10n\Middleware\SetLocale::class,
               \Goodcat\L10n\Middleware\DetectPreferredLocale::class,
           ]);
       });

3. Define localized routes using the lang() method.

   Route::get('{lang}/example', Controller::class)
       ->lang([
            'fr', 'de',
            'it' => 'it/esempio',
            'es' => 'es/ejemplo'
       ]);

That's it. You're all set to start using laravel-l10n.

Route translations

Use the lang() method to define route translations for different locales. This approach lets you manage multilingual URLs in an intuitive way.

Per-Route Translations

The lang() method accepts an array where you can specify your translations.

• For locales without a custom translation, like fr and de in the example, you must include the {lang} parameter in the route path. The resulting URL will be http://example.com/fr/example.
• For locales with a custom translation, like it and es, the array key represents the language code, and the value is the translated slug. The URLs will be http://example.com/it/esempio and http://example.com/es/ejemplo.

Route::get('{lang}/example', Controller::class)
    ->lang([
        'fr', 'de',
        'it' => 'it/esempio',
        'es' => 'es/ejemplo'
    ]);

Route groups

To avoid repetitive language definitions on every single route, you can use a route group. This approach is useful when you have multiple routes that share the same set of locales.

In the example below, the route group defines the supported locales (fr, de, it, es) and a {lang} URL prefix. Inside the group, the example route inherits these settings, but you can add specific translations with the lang() method.

Route::group([
    'lang' => ['fr', 'de', 'it', 'es'],
    'prefix' => '{lang}'
], function () {
    Route::get('/example', Controller::class)
        ->lang(['it' => 'esempio']);
});

Note

The lang() method is not designed to be a standalone group method. The syntax Route::lang()->group() is not supported. Instead, you must define the lang key directly inside the Route::group() array, as shown in the example above.

Hiding the Default Locale

By default, this package hides the default locale from your application's URLs. The default locale is the fallback_locale defined in your config/app.php file.

This means a route like {lang}/example will be served by the clean URL /example for the default language (e.g. English), while other locales will still include their prefix (e.g. fr/example).

If you prefer to include the locale prefix for all languages, you can easily change this behavior. Simply set the L10n::$hideDefaultLocale property to false in the boot() method of your AppServiceProvider.

use Goodcat\L10n\L10n;

class AppServiceProvider extends ServiceProvider
{
    public function boot(): void
    {
        L10n::$hideDefaultLocale = false;
    }
}

After this change, the {lang}/example route will be served by en/example for the default locale and fr/example for French, ensuring a consistent URL structure across all languages.

URL Generation

To seamlessly generate localized URLs, you must swap Laravel's default URL generator with the one provided by this package. This ensures that the route() helper automatically generates the correct URLs for the current locale without any extra steps.

Registering the Localized URL Generator

In the register() method of your AppServiceProvider, replace the default UrlGenerator instance with LocalizedUrlGenerator.

use Goodcat\L10n\Routing\LocalizedUrlGenerator;
use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider
{
    public function register(): void
    {
        $this->app->alias(LocalizedUrlGenerator::class, 'url');
    }
}

By aliasing the class to url, any use of the route() helper will now use the localized generator.

Using the route() Helper

Once the generator is registered, the route() helper will intelligently create URLs based on the current application locale.

• For the current locale: The helper automatically generates the correct URL based on the active language.
• For a specific locale: You can explicitly request a URL for a different language by passing the lang parameter to the route() helper.

// Assuming the current locale is 'en'
route('example'); // Returns "/example"

// To generate a URL for a different locale
route('example', ['lang' => 'fr']); // Returns "/fr/example"

// If a translation exists for 'it', the translated slug is used
route('example', ['lang' => 'it']); // Returns "/it/esempio"

Localized views

This package makes it easy to organize your views by language. The application's view loader is configured to automatically search for a localized version of a view before falling back to the generic one.

How it works

When you render a view, the system follows a specific search order based on the current application locale.

• Locale-specific path: The application first tries to find the view within a folder that matches the current locale. For example, if the locale is set to it, it will look for the example view in resources/views/it/example.blade.php.
• Generic path: If the view is not found in the locale-specific folder, it will then fall back to the generic resources/views/example.blade.php.

This makes it straightforward to organize your views with a clean, language-based folder structure, like the one below.

/resources/views
├── example.blade.php
├── /it
│   └── example.blade.php
└── /es
    └── example.blade.php

The example.blade.php file in the root views folder can serve as your default template, while the localized versions (it/example.blade.php, es/example.blade.php) contain language-specific content or layouts.

User Locale Preference

This package provides a robust mechanism for automatically detecting a user's preferred language. It adds the \app()->getPreferredLocale() and \app()->setPreferredLocale() methods to your Laravel application.

The DetectPreferredLocale middleware is responsible for populating the preferred locale. It does this by checking a series of configurable preferred locale resolvers.

By default, the package checks the following sources in order:

1. User-defined preference: It first looks for a preferredLocale() method on the authenticated user model. To use this, your user model must implement the HasLocalePreference interface. This allows logged-in users to have a persistent language setting.
2. Browser language: If no user-defined preference is found, it inspects the Accept-Language header of the user's browser (e.g. en-US,en;q=0.9).

Custom Locale Resolvers

If you need a different way to determine the preferred locale, you can create a custom resolver. This is useful for more specific logic, such as checking a session value, a cookie, or a query parameter.

To create a custom resolver, simply implement the PreferredLocaleResolver interface. The resolve() method receives the current request and should return the locale string or null if it can't be determined.

use Goodcat\L10n\Resolvers\PreferredLocaleResolver;
use Illuminate\Http\Request;

class DumbResolver implements PreferredLocaleResolver
{
    public function resolve(Request $request): ?string
    {
        return 'it'; // Everybody loves Italy. :P
    }
}

Then, you must register your custom resolver in the boot() method of your AppServiceProvider. By placing it at the beginning of the array, your resolver will be checked before the default ones.

use Goodcat\L10n\L10n;
use Illuminate\Support\ServiceProvider

class AppServiceProvider extends ServiceProvider
{
    public function boot()
    {
        L10n::$preferredLocaleResolvers = [
            new DumbResolver,
            ...L10n::getPreferredLocaleResolvers(),
        ];
    }
}

This flexible approach ensures you have full control over how your application detects and manages a user's language preferences.