<?PHP

  $cachefile = "cache/".$reqfilename.".html";
  $cachetime = 5 * 60; // 5 minutes

  // 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))." 
     -->n";
     exit;
  }
  ob_start(); // start the output buffer
?>

.. Your usual PHP script and HTML here ...

<?PHP
   // open the cache file for writing
   $fp = fopen($cachefile,'w'); 

   // save the contents of output buffer to the file
    fwrite($fp,ob_get_contents());

    // close the file

    fclose($fp); 

    // Send the output to the browser
    ob_end_flush(); 
?>

这是一个简单的缓存类型,

你可以在这里看到它

http://www.theukwebdesigncompany.com/articles/php-caching.php

你可以使用Smarty有缓存技术

http://www.nusphere.com/php/templates_smarty_caching.htm