> With PHP code written 15 years ago still works. If you never upgrade, sure. PHP 7 and each minor version in it have deprecated and removed plenty of stuff th

> With PHP code written 15 years ago still works. If you never upgrade, sure. PHP 7 and each minor version in it have deprecated and removed plenty of stuff that was legal in 5.6. PHP 8 is on track to do more of the same. I think the backwards incompatible changes are pretty much all good for the language, but claiming backwards compatibility in PHP is completely wrong. If you aren't on PHP 8, you aren't supported, and if you're on anything earlier than 7.4, you aren't getting security releases. And the new versions released yearly all have breaking changes, and get three years of security support. It's not 2015 anymore.