Response to http://www.catswhocode.com/blog/10-super-useful-php-snippets

simple_page_caching.php

<?php

ob_start();
register_shutdown_function(function(){
    $cacheFile = __DIR__.'/cache/'.date('Y-m-d');
    $cacheTime = 18000;
    if (file_exists($cacheFile) && time() - $cacheTime < filemtime($cacheFile)) {
        ob_end_flush();
        readfile($cacheFile);
    }
    file_put_contents($cacheFile, ob_get_flush());
});

//Anything here
phpinfo();

time.php

<?php

$zero = new DateTime('0000-00-00 00:00:00');
$now = new DateTime('now');
echo $now->diff($zero)->format('%Y years, %m months, %d days, %H hours, %i minutes, %s seconds');