/**
* methods used statically from the pagecache files
*/
public static function handleIfModifiedSince($modifiedTimestamp, $exit = true, $sendHeaders = true, $returnHeaders = false)
{
$headers = array();
$expiryTimestamp = time() + 60 * 60;
$time = null;
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
$time = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
$ifModifiedSince = preg_replace('/;.*$/', '', $time);
$timestamp = strtotime($ifModifiedSince);
} else {
$timestamp = 0;
}
$gmTime = mktime(gmdate('H'), gmdate('i'), gmdate('s'), gmdate('m'), gmdate('d'), gmdate('Y'));
$time = time();
$diff = $time - $gmTime;
if ($modifiedTimestamp <= $timestamp) {
if ($sendHeaders) {
header('HTTP/1.1 304 Not Modified');
}
if ($returnHeaders) {
$headers[] = 'Status: 304';
}
$addHeaders = AkCacheHandler::sendAdditionalHeaders($sendHeaders, $returnHeaders);
$headers = array_merge($addHeaders, $headers);
if ($exit) {
exit;
}
if ($returnHeaders) {
return $headers;
}
} else {
if ($sendHeaders) {
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $modifiedTimestamp) . ' GMT');
} else {
if ($returnHeaders) {
$headers[] = 'Last-Modified: ' . gmdate('D, d M Y H:i:s', $modifiedTimestamp) . ' GMT';
}
}
}
return $headers;
}