Twig has just been made compatible with PHP 8. The .travis.yml trick to run the test suite can be reused on this repo.

Then we'll have some deprecations/failures to take care of.

Is anyone willing to give it a try and make Symfony (3.4 first) compatible with PHP 8?

Todo:

• fix the nighlty job on Travis
• allow DBAL v3 once it's ready (v2 doesn't allow PHP8, even if it works but in a few edge cases)
• enable a PHP 8 job using GitHub Action
• enable skipped extensions on travis' job for nightly
• remove the 7.4.99 hack from the travis file once deps allow php 8
• remove weak deprecation mode once deps are ready (phpdocumentor)