PHP and frameworks

Laravel localization: A step-by-step guide — in this post you will discover how to get started with PHP Laravel i18n and l10n. It covers all the major topics, including working with translation messages, localizing date, time, and currency, adding locale middleware, and more.
PHP localization: A complete guide — this tutorial covers four different methods of localizing pure PHP applications (built without any frameworks). The described methods include Gettext, PHP arrays, Define, and setlocale.