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<?php exit; |
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|
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//Check everything exists before using it |
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if(!isset($_SERVER['HTTP_ACCEPT_ENCODING'])) |
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$_SERVER['HTTP_ACCEPT_ENCODING'] = ''; |
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if(!isset($_SERVER['HTTP_USER_AGENT'])) |
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$_SERVER['HTTP_USER_AGENT'] = ''; |
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|
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// Determine supported compression method |
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$gzip = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip'); |
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$deflate = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate'); |
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|
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// Determine used compression method |
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$encoding = $gzip ? 'gzip' : ($deflate ? 'deflate' : 'none'); |
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|
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// Check for buggy versions of Internet Explorer |
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if (!strstr($_SERVER['HTTP_USER_AGENT'], 'Opera') && |
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preg_match('/^Mozilla\/4\.0 \(compatible; MSIE ([0-9]\.[0-9])/i', $_SERVER['HTTP_USER_AGENT'], $matches)) |
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{ |
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$version = floatval($matches[1]); |
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|
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if ($version < 6) |
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$encoding = 'none'; |
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|
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if ($version == 6 && !strstr($_SERVER['HTTP_USER_AGENT'], 'EV1')) |
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$encoding = 'none'; |
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} |
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|
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//Some servers compress the output of PHP - Don't break in those cases |
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if(ini_get('output_handler') == 'ob_gzhandler' || ini_get('zlib.output_compression') == 1) |
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$encoding = 'none'; |
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|
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$iscompressed = file_exists(__FILE__.'.'.$encoding); |
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if($encoding != 'none' && $iscompressed == false) |
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{ |
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$flag = ($encoding == 'gzip' ? FORCE_GZIP : FORCE_DEFLATE); |
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$code = file_get_contents(__FILE__.'.none'); |
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$contents = gzencode($code,9,$flag); |
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}else{ |
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//Get data |
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$contents = file_get_contents(__FILE__.'.'.$encoding); |
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} |
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|
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// first check if we have to send 304 |
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// inspired by http://www.jonasjohn.de/snippets/php/caching.htm |
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|
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$eTag=md5($contents); |
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$modTime=filemtime(__FILE__.'.none'); |
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|
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date_default_timezone_set("UTC"); |
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$eTagMatch = (isset($_SERVER['HTTP_IF_NONE_MATCH']) && strpos($_SERVER['HTTP_IF_NONE_MATCH'],$eTag)); |
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$modTimeMatch = (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) === $modTime); |
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|
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if (($modTimeMatch)||($eTagMatch)) { |
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header('HTTP/1.1 304 Not Modified'); |
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header('Connection: close'); |
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} else { |
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// send all sorts of headers |
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$expireTime=60*60*24*355; // 1y max according to RFC |
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if ($encoding != 'none') { |
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header('Content-Encoding: '.$encoding); |
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} |
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header('Vary: Accept-Encoding'); |
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header('Content-Length: '.strlen($contents)); |
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header('Content-type: %%CONTENT%%; charset=utf-8'); |
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header('Cache-Control: max-age='.$expireTime.', public, must-revalidate'); |
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header('Cache-Control: max-age='.$expireTime.', public, immutable'); |
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header('Expires: '.gmdate('D, d M Y H:i:s', time() + $expireTime).' GMT'); |
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header('ETag: ' . $eTag); |
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header('Last-Modified: '.gmdate('D, d M Y H:i:s', $modTime).' GMT'); |
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|
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// send output |
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echo $contents; |
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|
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//And write to filesystem cache if not done yet |
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if($encoding != 'none' && $iscompressed == false) |
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{ |
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//Write the content we sent |
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file_put_contents(__FILE__.'.'.$encoding,$contents); |
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|
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//And write the new content |
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$flag = ($encoding == 'gzip' ? FORCE_DEFLATE : FORCE_GZIP); |
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$ext = ($encoding == 'gzip' ? 'deflate' : 'gzip'); |
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$contents = gzencode($code,9,$flag); |
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file_put_contents(__FILE__.'.'.$ext,$contents); |
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} |
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} |
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|
