Php enables gzip compression to accelerate the website

Php enables gzip compression to accelerate the website

Note: After the compressed files are cached on the server, the re-access will reduce the re-compression time and reduce the CPU usage. By setting the client file cache time, you can reduce the number of re-requests by more than 85%. Because the image is already in the compression format, it only sets the client cache time and does not compress the image. Usage: The server must support the gzip and Rewrite functions. Add the following code RewriteRule (.. Css $ |.. Js $ |.. Jpg $ |.. Gif $ |. *. png $) gzip. php? $1 Upload gzip. php to the root directory 4. create a cache folder in the root directory to ensure read/write. /** * @ Author Seraphim * @ Copyright 2012 */ // Function sendheader ($ last_modified, $ p_type, $ content_length = 0) { // Set the client cache validity period Header ("Expires:". gmdate ("D, d m y h: I: s", time () + 15360000). "GMT "); Header ("Cache-Control: max-age = 315360000 "); Header ("Pragma :"); // Set the last modification time Header ("Last-Modified:". $ last_modified ); // Set file type information Header ($ p_type ); Header ("Content-Length:". $ content_length ); } Define ('abspath', dirname (_ file __).'/'); $ Cache = true; $ Cachedir = 'cache/'; // Directory for storing the gz file to ensure that the file can be written If (empty ($ _ SERVER ['query _ string']) Exit (); $ Gzip = strstr ($ _ SERVER ['http _ ACCEPT_ENCODING '], 'gzip '); If (empty ($ gzip )) $ Cache = false; $ Key = array_shift (explode ('? ', $ _ SERVER ['query _ string']); $ Key = str_replace ('../', '', $ key ); $ Filename = ABSPATH. $ key; $ Symbol = '_'; $ Rel_path = str_replace (ABSPATH, '', dirname ($ filename )); $ Namespace = str_replace ('/', $ symbol, $ rel_path ); $ Cache_filename = ABSPATH. $ cachedir. $ namespace. $ symbol. basename ($ filename ). '.Gz '; // Generate the gz file path $ Ext = array_pop (explode ('.', $ filename); // you can specify the file type based on the suffix. $ Type = "Content-type: text/html"; // Default file type Switch ($ ext) { Case 'css ': $ Type = "Content-type: text/css "; Break; Case 'js ': $ Type = "Content-type: text/javascript "; Break; Case 'GIF ': $ Cache = false; $ Type = "Content-type: image/gif "; Break; Case 'jpg ': $ Cache = false; $ Type = "Content-type: image/jpeg "; Break; Case 'PNG ': $ Cache = false; $ Type = "Content-type: image/png "; Break; Default: Exit (); } If ($ cache) { If (file_exists ($ cache_filename )) {// If the gz file exists $ Mtime = filemtime ($ cache_filename ); $ Gmt_mtime = gmdate ('d, d m y h: I: S', $ mtime). 'gmt '; If (isset ($ _ SERVER ['http _ IF_MODIFIED_SINCE ']) & array_shift (explode ('; ', $ _ SERVER ['http _ IF_MODIFIED_SINCE']) = $ Gmt_mtime )) { // The file modification date is the same as that in the browser cache, and 304 is returned. Header ("HTTP/1.1 304 Not Modified "); // Send the client header Header ("Content-Encoding: gzip "); Sendheader ($ gmt_mtime, $ type ); } Else { // Read the gz file output $ Content = file_get_contents ($ cache_filename ); // Send the client header Sendheader ($ gmt_mtime, $ type, strlen ($ content )); Header ("Content-Encoding: gzip "); // Send data Echo $ content; } } Else If (file_exists ($ filename )) {// No corresponding gz file $ Mtime = mktime (); $ Gmt_mtime = gmdate ('d, d m y h: I: S', $ mtime). 'gmt '; // Read the file $ Content = file_get_contents ($ filename ); // Remove the blank part // $ Content = ltrim ($ content ); // Compress the file content $ Content = gzencode ($ content, 9, $ gzip? FORCE_GZIP: FORCE_DEFLATE ); // Send the client header Sendheader ($ gmt_mtime, $ type, strlen ($ content )); Header ("Content-Encoding: gzip "); // Send data Echo $ content; // Write a file File_put_contents ($ cache_filename, $ content ); } Else { Header ("HTTP/1.0 404 Not Found "); } } Else {// The output in Gzip mode is not used for processing. The principle is basically the same as above. If (file_exists ($ filename )) { $ Mtime = filemtime ($ filename ); $ Gmt_mtime = gmdate ('d, d m y h: I: S', $ mtime). 'gmt '; If (isset ($ _ SERVER ['http _ IF_MODIFIED_SINCE ']) & array_shift (explode ('; ', $ _ SERVER ['http _ IF_MODIFIED_SINCE']) = $ Gmt_mtime )) { // The file modification date is the same as that in the browser cache, and 304 is returned. Header ("HTTP/1.1 304 Not Modified "); // Send the client header Sendheader ($ gmt_mtime, $ type, strlen ($ content )); Header ("Content-Encoding: gzip "); } Else { // Read file output $ Content = file_get_contents ($ filename ); // Send the client header Sendheader ($ gmt_mtime, $ type, strlen ($ content )); // Send data Echo $ content; } } Else { Header ("HTTP/1.0 404 Not Found "); } } ?>

Php, gzip