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<?php //Check everything exists before using it if(!isset($_SERVER['HTTP_ACCEPT_ENCODING'])) $_SERVER['HTTP_ACCEPT_ENCODING'] = ''; if(!isset($_SERVER['HTTP_USER_AGENT'])) $_SERVER['HTTP_USER_AGENT'] = ''; // Determine supported compression method $gzip = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip'); $deflate = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate'); // Determine used compression method $encoding = $gzip ? 'gzip' : ($deflate ? 'deflate' : 'none'); // Check for buggy versions of Internet Explorer if (!strstr($_SERVER['HTTP_USER_AGENT'], 'Opera') && preg_match('/^Mozilla\/4\.0 \(compatible; MSIE ([0-9]\.[0-9])/i', $_SERVER['HTTP_USER_AGENT'], $matches)) { $version = floatval($matches[1]); if ($version < 6) $encoding = 'none'; if ($version == 6 && !strstr($_SERVER['HTTP_USER_AGENT'], 'EV1')) $encoding = 'none'; } //Some servers compress the output of PHP - Don't break in those cases if(ini_get('output_handler') == 'ob_gzhandler' \|\| ini_get('zlib.output_compression') == 1) $encoding = 'none'; $iscompressed = file_exists(__FILE__.'.'.$encoding); if($encoding != 'none' && $iscompressed == false) { $flag = ($encoding == 'gzip' ? FORCE_GZIP : FORCE_DEFLATE); $code = file_get_contents(__FILE__.'.none'); $contents = gzencode($code,9,$flag); }else{ //Get data $contents = file_get_contents(__FILE__.'.'.$encoding); } // first check if we have to send 304 // inspired by http://www.jonasjohn.de/snippets/php/caching.htm $eTag=md5($contents); $modTime=filemtime(__FILE__.'.none'); date_default_timezone_set("UTC"); $eTagMatch = (isset($_SERVER['HTTP_IF_NONE_MATCH']) && strpos($_SERVER['HTTP_IF_NONE_MATCH'],$eTag)); $modTimeMatch = (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) === $modTime); if (($modTimeMatch)\|\|($eTagMatch)) { header('HTTP/1.1 304 Not Modified'); header('Connection: close'); } else { // send all sorts of headers $expireTime=606024*355; // 1y max according to RFC if ($encoding != 'none') { header('Content-Encoding: '.$encoding); } header('Vary: Accept-Encoding'); header('Content-Length: '.strlen($contents)); header('Content-type: text/javascript; charset=utf-8'); header('Cache-Control: max-age='.$expireTime.', public, must-revalidate'); header('Cache-Control: max-age='.$expireTime.', public, immutable'); header('Expires: '.gmdate('D, d M Y H:i:s', time() + $expireTime).' GMT'); header('ETag: ' . $eTag); header('Last-Modified: '.gmdate('D, d M Y H:i:s', $modTime).' GMT'); // send output echo $contents; //And write to filesystem cache if not done yet if($encoding != 'none' && $iscompressed == false) { //Write the content we sent file_put_contents(__FILE__.'.'.$encoding,$contents); //And write the new content $flag = ($encoding == 'gzip' ? FORCE_DEFLATE : FORCE_GZIP); $ext = ($encoding == 'gzip' ? 'deflate' : 'gzip'); $contents = gzencode($code,9,$flag); file_put_contents(__FILE__.'.'.$ext,$contents); } }

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