问PHP不会让页面每天/6小时自动更新

EN

$cachefile = "rankings.html";
$daycachefile = "rankings_history.xml";
$cachetime = (60 * 60) * 6; // every 6 hours, the cache refreshes
$daycachetime = (60 * 60) * 24; // every 24 hours, the history will be written to - or whenever the page is requested after 24 hours has passed
$writenewdata = false;

if (!empty($_GET['reload']))
{
    if ($_GET['reload']== 1)
    {
        $cachetime = 1;
    }
}

if (!empty($_GET['reloadhistory']))
{
    if ($_GET['reloadhistory'] == 1)
    {
        $daycachetime = 1;
        $cachetime = 1;
    }
}

if (file_exists($daycachefile) && (time() - $daycachetime < filemtime($daycachefile)))
{
    // Do nothing
}
else
{
    $writenewdata = true;
    $cachetime = 1;
}

// 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