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 default php version. Is this possible in php?

The reason I want to do this is because I have thousands of lines of code which call mail() and I don't want to rewrite all of them.

Also for future reference, in computer programming, what is it called when you do something like this?

Answer 1

There is an extension that allows you to override functions. It is meant to be used for debugging, but I guess you can use it for your needs. Take a look:

http://www.php.net/manual/en/function.override-function.php

If you wish to call the original function within your version, make sure you read this comment: http://no.php.net/manual/en/function.override-function.php#50821