| | |
| | | |
| | | |
| | | // send header with expire date 30 days in future |
| | | function send_future_expire_header() |
| | | function send_future_expire_header($offset=2600000) |
| | | { |
| | | if (headers_sent()) |
| | | return; |
| | | |
| | | header("Expires: ".gmdate("D, d M Y H:i:s", mktime()+2600000)." GMT"); |
| | | header("Cache-Control: "); |
| | | header("Expires: ".gmdate("D, d M Y H:i:s", mktime()+$offset)." GMT"); |
| | | header("Cache-Control: max-age=$offset"); |
| | | header("Pragma: "); |
| | | } |
| | | |
| | | |
| | | // check request for If-Modified-Since and send an according response |
| | | function send_modified_header($mdate, $etag=null) |
| | | { |
| | | if (headers_sent()) |
| | | return; |
| | | |
| | | $iscached = false; |
| | | if ($_SERVER['HTTP_IF_MODIFIED_SINCE'] && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $mdate) |
| | | $iscached = true; |
| | | |
| | | $etag = $etag ? "\"$etag\"" : null; |
| | | if ($etag && $_SERVER['HTTP_IF_NONE_MATCH'] == $etag) |
| | | $iscached = true; |
| | | |
| | | if ($iscached) |
| | | header("HTTP/1.x 304 Not Modified"); |
| | | else |
| | | header("Last-Modified: ".gmdate("D, d M Y H:i:s", $mdate)." GMT"); |
| | | |
| | | header("Cache-Control: max-age=0"); |
| | | header("Expires: "); |
| | | header("Pragma: "); |
| | | |
| | | if ($etag) |
| | | header("Etag: $etag"); |
| | | |
| | | if ($iscached) |
| | | exit; |
| | | } |
| | | |
| | | |
| | | // function to convert an array to a javascript array |
| | | function array2js($arr, $type='') |
| | | { |