jenjen8 - 3:20 am on Dec 17, 2007 (gmt 0)

I am trying to use YUM to upgrade the PHP version in my VPS from 4.3.9 to 5.x. I use YUM to do so.

> yum update php

After a reboot, the PHP version is still the same.

I am not sure how the yum works and where yum gets its software updates from.

Must I update YUM first?
How can I update yum?
Is there other ways to update software like RPM? I am not sure about RPM as well.

I would like to understand YUM more so that I can update other software. The OS is CentOS 4.