There are various ways of implementing a cache to do this, but the easiest to implement (if maybe not the most efficient) is to use a bit of extra PHP code in your scripts. Most of this example is based on this site, but could easily be applied to any site.
For the purposes of this example it helps to have a small understanding of my website. Basically each page location (e.g. "site/caching") has each / replaced by a . and that file (which contains all the content) is included into the template (so includes/design.caching in this case). The actual filename ends up in a variable called $reqfilename.
Lets look at the most basic, and rather useless, cache. This little snippet of code will save the output of a call for the "home" page into a file called home.html
<?php
// start the output buffer
ob_start(); ?>
//Your usual PHP script and HTML here ...
<?php
$cachefile = &q
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