PHP Cache

Create a PHP file called, cache_header.php and paste the below code:

<?php
$url = $_SERVER["SCRIPT_NAME"];
$break = explode('/', $url);
$file = end($break);
$cachefile = 'cached-' . substr_replace($file, "", -4) . '.html';
$cachetime = 18000;

// Serve from the cache if it is younger than $cachetime
if (file_exists($cachefile) && (time() - $cachetime < filemtime($cachefile))) {
    echo "<!-- Cached copy, generated " . date('H:i', filemtime($cachefile)) . " -->\n";
    readfile($cachefile);
    exit;
}

ob_start(); // Start the output buffer
?>

Now, create an another PHP file called, cache_footer.php and paste the below code:

<?php
// Cache the contents to a cache file
$cached = fopen($cachefile, 'w');
fwrite($cached, ob_get_contents());
fclose($cached);
ob_end_flush(); // Send the output to the browser
?>

Include both files in the page you wish to create, primarily for a static content page such as 'about us' or 'terms of service', whose content is derived from the database:

For example, I have included both the files in about-us.php file.

<?php
// pages/about-us.php
include('top-cache.php'); 
// rest of the PHP code
include('bottom-cache.php');
?>