Pre-update questions on PHP 5.3 + PHP 5.4 CB 2.0

Hi there everyone,



I was thinking and researching about having two or three PHP versions with DirectAdmin.



I running:

CentOS 6.5

DA - the latest version (at the moment of creation on this post)

Custoumbild 2.0

mod_ruid2

PHP - 5.3.x



Is there any specific thing i need to watch out for of running several PHP versions on the one server?

Is there any official guide? (have not found any)



* I only know that this is possible, but still struggling at the moment to process on update the production server...



Thank you in andvance.

Pre-update questions on PHP 5.3 + PHP 5.4 CB 2.0