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