I need to make a change to the php.ini file, but I can't find it. Where does this normally reside?

I saw in some other threads that it could be in /ftp/usr/lib, but it's not there. That folder on my server has several other folders in it (apache, gconv, i686, locale, sasl, sendmail), and then a bunch of files (beginning with ld-2.2.4.so and ending with libz.so.1.1.4). All the files begin with L. There's no php.ini file here.

I installed version 4.4.4 from my Applications page.

Thanks.

- Tom