PHP Internal Git Server Hacked, Backdoor Inserted into Source
Looks like the current trend of supply chain attacks has hit PHP.
Looks like they will switch over to GitHub as main repo instead of their current https://git.php.net/ because of the security incident.
The backdoor was removed before it was compiled into a binary for admins to download so there is no issue for anyone running PHP. However this does prove to be an issues in regards to PHP's safety - They have moved to GitHub (@girish mentions in his reply) and will be better closely monitoring pushes and merges into the code base.
PHP's Own Nikita Popov: "The changes were on the development branch for PHP 8.1, which is due to release at the end of the year" which means the code has not been distributed. It's a big deal but not as big as everyone is making it out to be.
Hopefully this does NOT happen again.