The dbx database functions were removed from the PHP 5.1.0 base
They are now maintained as a PECL extenstion
Source is avialable from:
I use these functions to allow easy flebility to switch databases without having
to change code except for the intial connection string.
Please add dbx extentions to the php rpm or make them available in a seperate rpm
*** This bug has been marked as a duplicate of 186690 ***