Installing Drupal

I installed drupal earlier today, its using a virtual host through apache.

I receive the following error on viewing the index.php

Fatal error: Call to undefined function: array_map() in includes/database.mysql.inc on line 16

Anyone have any suggestions as to what the problem may be?
I have a suspicion that it may have something to do with my PHP4 installation...since it was giving me troubles earlier.

"Register" points to module.php which contains:

Hi,

Though I'm new here, I still thought I'd ask:

I tried to logon using my blogger.com ID and password and failed both on www.drupal.org and on www.drop.org
I'm 100% sure my password and ID were correct AND I used ID@blogger.com but it didn't work.

Hi!
I just wanna know if it is possible to register new user without having a smtp on my computer. I suppose Dupal is a great portal system but I can't register as an admin so I can' really use it.
If anybody knows the answer I would appreciate your help very much.

What is the procedure for reporting bugs in the separately downloadable modules? The bug system does not seem to include these.

Hi

I want to use Drupal in a small community of trusted users, so i want to completely turn off moderation. Articles should not go to the submission queue, but directly appear wherever they belong. Is this possible without giving all users more or less full administration rights?

TIA
john