Hi,

There is no bug in 5.3 that stop your applications to be work in orders, so ignore the person post.

If you want to upgrade your PHP from 5.1 to 5.3. its simply advise that you first uninstall 5.1, and its all modules.

Follow this POST and replace 2 with 3.
feronso Reviewed by feronso on . Php Cent OS upgrade Hello. I am running vBulletin 4.1.8. I tried to upgrade to vBulletin 4.1.9 today, my PHP version was too low. My php version is 5.1.6. In the vBulletin upgrade it said I needed at-least PHP version 5.2 or greater. I asked vBulletin support what the greatest vBulletin version for php I could use is, they replied saying "PHP 5.3.x" Basically I need the easiest tutorial on how to upgrade from PHP 5.1.6 to 5.3.x Also what is the greatest PHP version out? Rating: 5