Upgrading to PHP 5 on Tiger and Apache 1.3

I need a little help with configuring php on my local server. I love XHTML/CSS and a bit of php, WordPress, and Rails - but I'm terrible at this server stuff. I'm petrified of screwing my configuration.
I'm running everything from the default OS X Apache server (I'm on Tiger OS X 10.4.10). I prefer using the internal server to all-in-one apps like MAMP and Locomotive. I have phpMyAdmin v2.10.2, MySQL v5.0.24a, and I think I'm running php 4.4.7 (typing php -v whilst in my document root in terminal returns version 4.4.7).
I now want to use the latest version of php. However, I can't remember if I upgraded php when I was installing MySQL etc. If not, is it possible that I installed the latest version, and I'm just not using at the moment (which could be why terminal is saying it's version 4.4.7)? Is there anyway to check for dormant versions of php or to switch over to running a different version?
If I don't have it, I need to install it. Is there an easy way of doing this via an installer? Is there anything I need to watch-out for whilst I'm attempting this feat?
Also, does Leopard bring many advancements on the server front, i.e. Apache 2, php 5, MySQL etc, which might save me some hassle if I just go through the inevitable OS upgrade sooner rather than later?
Any help is much appreciated.

I now want to use the latest version of php. However, I can't remember if I
upgraded php when I was installing MySQL etc. If not, is it possible that I
installed the latest version, and I'm just not using at the moment (which could
be why terminal is saying it's version 4.4.7)? Is there anyway to check for
dormant versions of php or to switch over to running a different version?
Well you could try this in terminal:
<pre style="font-family: monospaced;">locate php</pre>
It should show you nearly everything associated with php. As far as what the php version command lists this only picks up the CLI version of php not necessarily whats running on the web server. throw a php file in your webroot with the following code in it to see what the server is using:
<pre style="font-family: monospaced;"><?php phpinfo(); ?></pre>
That will give you the lowdown on what Apache is configured with. this is goign to depend on what mod_php is being used.
Generally i wouldnt upgrade anything that lives in the system as you never know if it might get overwritten or updated when a system update comes down from apple. A better practice is to install the version you want to use to /usr/local/<dirname> so that the installations are isolated and manageable.
If I don't have it, I need to install it. Is there an easy way of doing this via
an installer? Is there anything I need to watch-out for whilst I'm attempting
this feat?
I generally use the php packages from www.entropy.ch just so i dont have to bother with compiling. My versions of Ruby, Apache 2.0.x and Apache 2.2.x i compiled myself, along with an upgraded version of Python and alot of other libraries.
Then you can jsut make some changes to configuration files to use the versions you want. However if you use the entropy.ch packages of php as i suggested the installer takes care of the configuration changes for you. Jsut make sure you grab the one for the proper version of apache youre going to be using it with.
Additionally you could always get Mac/DarwinPorts - whatever its called now... this is a package manager like apt-get or yum under linux. It fetaches the package for you from a repository, and installs it. I dont use these because they use a different dir structure than standard Darwin - ie. the create the /opt folder and install under this. I dont really like that so i dont use them - but that isnt going to cause you any problems, its jsut a preference thing.
Also, does Leopard bring many advancements on the server front, i.e. Apache 2,
php 5, MySQL etc, which might save me some hassle if I just go through the
inevitable OS upgrade sooner rather than later?
I know it comes with apache 2. I think it may also come with php 5.1.6 (5.2.x is avialable though).. not sure about MySQL at all...

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