Does PHP optimize tail recursion?

Question

I wrote a small piece of code that I believe should have succeeded if tail recursion was optimized, however it blew up the stack. Should I conclude PHP does not optimize tai

Answer 1

It is possible to call recursive functions in PHP. However avoid recursive function/method calls with over 100-200 recursion levels as it can smash the stack and cause a termination of the current script.

http://php.net/manual/en/functions.user-defined.php

Seems like a safe assumption that it's not.