The Problem
The Solution
Some modifications can be changed via ini settings. For others you may have to recompile PHP.
Ini Settings
For ini settings you can change the ini file, but an easier way is to add configuration settings to the .htaccess fill. By adding changes to the .htaccess file, you will not affect other sites. The changes will only affect the directory the .htaccess file is in and all subdirectories.
Recompile Changes
In order to upgrade php or add modules such as GD, Curl, mbstrings, etc you will need to recompile apache and php. Fortunatly, cPanel makes this easy.
Login into the WHM. Select software>apache updates. (You can get the password from orbit)
At the first step leave the default profile and click next.
When you get to step five, click on the expanded list. This where you can make your settings.
Recompiling will take around 10 minutes and you have to let it finish.