PHP 5.2.x and 5.3.x installed concurrently

Just wondered if anyone had installed PHP 5.2.x and PHP 5.3.x to run side by side. I predominantly want to run my websites on PHP 5.3.x but there are some drupal 6 sites which still need running on PHP 5.2.x. Please advise? Many thanks in advance.
 
If I run them concurrently then one of PHPs has to be a fastcgi set-up which I haven't fully tested. I think I like the idea of a jail and having mod_php set-ups in both environments. Many thanks for your help!
 
Don't use PHP 5.2.x, it's been End-of-Life since December 2010. That means NO security fixes and NO support.

Putting this on the web is just begging to get hacked.
 
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