-/**
- * Check request for If-Modified-Since and send an according response.
- * This will terminate the current script if headers match the given values
- *
- * @param int Modified date as unix timestamp
- * @param string Etag value for caching
- */
-function send_modified_header($mdate, $etag=null, $skip_check=false)
-{
- if (headers_sent())
- return;
-
- $iscached = false;
- $etag = $etag ? "\"$etag\"" : null;
-
- if (!$skip_check)
- {
- if ($_SERVER['HTTP_IF_MODIFIED_SINCE'] && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $mdate)
- $iscached = true;
-
- if ($etag)
- $iscached = ($_SERVER['HTTP_IF_NONE_MATCH'] == $etag);
- }
-
- if ($iscached)
- header("HTTP/1.x 304 Not Modified");
- else
- header("Last-Modified: ".gmdate("D, d M Y H:i:s", $mdate)." GMT");
-
- header("Cache-Control: private, must-revalidate, max-age=0");
- header("Expires: ");
- header("Pragma: ");
-
- if ($etag)
- header("Etag: $etag");
-
- if ($iscached)
- {
- ob_end_clean();
- exit;
- }
-}
-
-