We have strong opinions about this, and we explained them here: https://translation.io/blog/gettext-is-better-than-rails-i18...

Even if we compared GetText to YAML key/values (Ruby on Rails), the same reasoning applies also for PHP key/values of Laravel.

Laravel is currently the only integration in the PHP-world. But most of the code could certainly be reused for a Symfony application, or any other PHP project.

We think that every framework must have a tailored solution to handle translations best, so we move forward in small steps to be sure our solution fits the pain (of maintaining translations up-to-date as the app evolves).