Upgrading PHP

[phpnewbiex]

Hello,

I've been able to succesfully compile and install php from source numerous times, however, I am not entirely sure how to upgrade.

Let's say I was to install PHP 4.2.3

I would run the commands:

./configure --options
make
make install

If I already have PHP 4.2.3 installed on a system, and I download PHP 4.3.0, would I run the exact same commands? Would there be PHP 4.2.3 files I have to delete before or after?

Thanks.