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<?php //get the last-modified-date of this very file $lastModified=filemtime($_SERVER['SCRIPT_FILENAME']); //get a unique hash of this file (etag) $etagFile = md5_file($_SERVER['SCRIPT_FILENAME']); //get the HTTP_IF_MODIFIED_SINCE header if set $ifModifiedSince=(isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? $_SERVER['HTTP_IF_MODIFIED_SINCE'] : false); //get the HTTP_IF_NONE_MATCH header if set (etag: unique file hash) $etagHeader=(isset($_SERVER['HTTP_IF_NONE_MATCH']) ? trim($_SERVER['HTTP_IF_NONE_MATCH']) : false); header("Last-Modified: ".gmdate("D, d M Y H:i:s", $lastModified)." GMT"); header("Etag: $etagFile"); $ttc=60*60*24*8; header('Cache-Control: private; max-age='.$ttc); header('Expires: '.gmdate("D, d M Y H:i:s", time() + $ttc)); header("Pragma: cache"); //check if page has changed. If not, send 304 and exit if (@strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE'])==$lastModified || $etagHeader == $etagFile) { header("HTTP/1.1 304 Not Modified"); exit; } //your normal code echo "<!-- This page was last modified: ".date("d.m.Y H:i:s",$lastModified)." -->"; ?>
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