While I agree that Perl influenced Ruby which I guess in turn influenced CoffeeScript and Elixir to some degree, the lineage of PHP seems to be dead. I don't really know any languages that are inspired by PHP itself, other than maybe Hack which one could argue is very closely related to PHP.

Even if the lineage dies with PHP, that pulls in Facebook and WordPress.

Smarty could possibly take credit for inspiring some of the template engines out there also.

I still write and actually still (sorta-kinda) like PHP, but there's no major concept/feature I can think of that's intrinsic to PHP rather than inherited from other languages. The Perl (and general "C-like language" influence is notable, and as PHP has matured it's started to feel ever more like Java. ("To write a simple PHP server app, first just initialize your PSR-11 compatible dependency injection container and add your PSR-7 compatible HTTP request/response handlers to it...")

The mixed code/template capability seems to have led to JSX.

React(Js framework) is close to PHP as a concept. Facebook's team had to take ideas from their exisitng code. With JSX, we could potentially call it a new language.

E4X (https://en.wikipedia.org/wiki/ECMAScript_for_XML) is also a likely inspiration for JSX.