Because WP Fragment Cache requires PHP version 5.3.6 or greater, and I want to use this on our website, I am going to attempt an upgrade of PHP tomorrow evening.

     Because of the integration of PHP with so many other components, most importantly mysql and Apache, there is a non-trivial chance of something going really wrong.

     To safeguard against permanent damage, I am going to take the web server down, image it, then perform the upgrade.

     If all goes well, I’ll take it down again and make another backup with the new PHP installed.

     If all does not go well, I’ll take it down and restore from the just made image.

     Either way, there will be two down periods lasting about 20 minutes each between 10PM and midnight tomorrow evening July 10th.