Application Localization

A PHP and JavaScript localization library that automatically discovers translatable strings in your source files and stores translations in simple INI files. Drop in the built-in editor UI and your team can start translating without touching code.

Features

• Automatic string discovery — scans PHP and JavaScript source files for translation function calls
• Built-in translator UI — a ready-made editor that integrates into any existing interface
• Clientside translations — auto-generated JavaScript include files bring t() to the browser
• Translation context — optional context strings help translators understand ambiguous texts
• Countries, locales & currencies — classes for 19 countries, 18 locales, 10 currencies, and 21 time zones with country-specific formatting
• Locale alias handling — automatically normalizes uk/gb and en_UK/en_GB mix-ups

Scope note: The included countries, locales, and currencies reflect what is commonly needed in typical european-centric web applications, not a complete i18n universe. See the full list of supported countries and locales.

Requirements

• PHP 8.4 or higher
• Composer

Quick Start

1. Install via Composer

composer require mistralys/application-localization

2. Configure the library

useAppLocalize\Localization;
// Register the locales your app supports (english is the native locale)
Localization::addAppLocale('de_DE');
Localization::addAppLocale('fr_FR');
// Register a source folder to scan for translatable strings
Localization::addSourceFolder(
'my-app',
'My Application',
'Core',
'/path/to/ini/files/',
'/path/to/source/files/'
);
// Finalize configuration (always last)
Localization::configure('/path/to/cache.json');

3. Translate strings in PHP

usefunctionAppLocalize\t;
usefunctionAppLocalize\pt;
$message = t('Welcome back, %1$s!', $username);
pt('Save changes');

4. Translate strings in JavaScript

varmessage=t('Welcome back, %1$s!',username);

5. Switch the active locale

Localization::selectAppLocale('de_DE');

Learn More

Topic	Document
Full setup walkthrough	Configuration Guide
Translation functions, placeholders & best practices	Translation Functions
Countries, currencies & time zones API	Countries, Currencies & Time Zones
Supported countries, locales & currencies	Supported countries and locales
Changelog	changelog.md
Packagist	mistralys/application-localization

Example

Run composer update in the package folder and open the example/ directory in your browser (package must be inside your webserver's document root) to see the editor UI live.

Origins

This library grew out of several internal applications before being extracted into a standalone package. It makes no claim of replacing established i18n libraries — it simply solves a specific set of localization needs cleanly and pragmatically.