Update: Plesk 12 supports multiple PHP versions out of the box!

This script will automatically install & configure PHP 5.5.23 on Plesk 11.5 & 12 on CentOS 6.

Usage

==Disclaimer: use this at your own risk! Please read and understand the script before executing!==

wget -O - https://gist.githubusercontent.com/Stayallive/92e841e7dd89c8509c15/raw/3bc61e5bc304ea0346a0efb417cbb6378f70b9b3/install.sh | bash

The Script