PHP has been around forever... no shame in the game.

As long as you're productive and hopefully have learned to use the newer features and moved to typed PHP.

A couple of years ago I worked on a MASSIVE project which will remain nameless, backend is a highly scaleable microservices system entirely built in PHP w/ a CQRS pattern.

Scales beautifully... I'm sure could be more efficient in some other language in some places, but worth the effort? likely not.