Is it possible to replace (monkeypatch) PHP functions?

Question

You can do this in Python, but is it possible in PHP?

>>> def a(): print 1
... 
>>> def a(): print 2
... 
>>> a()
2

Answer 1

As jmikola mentioned, Patchwork is a good solution if you want to add code to a function.

Here's an article about how it works: http://phpmyweb.net/2012/04/26/write-an-awesome-plugin-system-in-php/

It comes with some sample code. I think the phpmyweb version uses a slightly better code, because he doesn't use eval()'d code, unlike patchwork. You can cache opcodes when using eval().