You know what're you installing ? You know wat means Apache, and PHP ?
So, why you install it ?
It's supposed :) to use it to serve web pages. PHP is not a software, is a Scripting language. Apache is a Web Server. It can serve html, php, or other languages to virtually any web server browser (safari, firefox, iexplorer, ...).
So, you can point to you iphone server and read 'your' web pages, if you are supposed to develope it.