Is it possible to replace a function in php (such as mail) and make it do something else?

Question

I want to rewrite a function in PHP (let\'s say the mail() function), and want to make it so when I call mail() from now on, it will load my version of mail() and not the de

Answer 1

It's called function overloading and is not possible in native PHP but possible using the extensions outlined in the other answers. The PHP documentation claims it is not possible at all: source which is incorrect.