How do I downgrade my PHP to PHP4?

Recompiling PHP within cPanel/WHM is pretty easy. Just follow the steps below, and you will be fine:

go to your /whm (http://yourdomain.com/whm)
Scroll down to “Software”
There you will find “Apache Update”
Click on “Apache Update”
At the top of this page, you will see “load previous config”, click on that.
All you now need to do is select the PHP version, we recommend that you use PHP 4.4.5 its one of the more stable versions.
Now simply click “Start Build”
Go grab some coffee, it will take a bit.
Once completed, that’s it!