Can/Does xenForo do...

[Kestryll]

I am currently running vBulletin 3.8.9 with some customization and don't want to go to vb4 because it doesn't do a few fundamental things.
I run banner ads hosted in house using the php 'random' function which was disabled in vb4, does xenForo use this function?
The other things I need are a paid membership usergroup (voluntary in addition to the regular free membership), and some form of trader rating system.

 

[Paul B]

The PHP random function is not disabled in XF.

Paid user account upgrades are built in.

There are third party add-ons available which are related to trader rating.