Install Multiple PHP Versions on Plesk 11.5 CentOS 6.4 x64

An automated Plesk  update upgraded PHP to 5.4.x breaking older sites hosted on the server. Our Admins noticed that Plesk Linux 11.5 finally supported multiple versions of PHP, much like the Plesk Windows version. After upgrading to Plesk 11.5 we discovered that the installation instructions to install multiple versions of PHP were slightly incomplete. After…