/**
* Checks if content has changed by the last modified timestamp.
*
* HTTP_IF_MODIFIED_SINCE feature
*
* @param int $lastModified HTTP Last-Modified Timestamp
*/
public static function sendLastModified($lastModified = null)
{
if (!$lastModified) {
$lastModified = time();
}
$lastModified = gmdate('D, d M Y H:i:s T', (double) $lastModified);
// Sende Last-Modification time
header('Last-Modified: ' . $lastModified);
// Last-Modified Timestamp gefunden
// => den Browser anweisen, den Cache zu verwenden
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && $_SERVER['HTTP_IF_MODIFIED_SINCE'] == $lastModified) {
self::cleanOutputBuffers();
header('HTTP/1.1 ' . self::HTTP_NOT_MODIFIED);
exit;
}
self::$sentLastModified = true;
}
