PHP caching

<?
$cachefile = 'cache/filename.cache';
$cachetime = 60; // 60 sec
// Serve from the cache if it is younger than $cachetime
if (file_exists($cachefile) && (time() - $cachetime < filemtime($cachefile))) {
 include($cachefile);
 echo "<!-- Cached ".date('jS F Y H:i', filemtime($cachefile))." -->";
 exit;
}
ob_start(); // start the output buffer
?>

your HTML / normal php code here.

<?
$fp = fopen($cachefile, 'w'); // open the cache file for writing
fwrite($fp, ob_get_contents()); // save the contents of output buffer to the file
fclose($fp); // close the file
ob_end_flush(); // Send the output to the browser
?>