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?