如何在Mac OS X Snow Leopard上启用mysqli？

I am trying to enable mysqli on Mac OS X. I am using MAMP and I have tried XAMPP (I am open to either), but when I open the php.ini file and search for anything containing the word "mysqli" nothing is found, and when I try to run a PHP script containing any mysqli code, nothing happens: no errors are output, the script just fails to execute.I am trying to enable mysqli on Mac OS X. I am