Cache code sharing for a php website

Cache code sharing for a php website

/** * @ Author Seraphim * @ Copyright 2012 * @ Link http://bbs.it-home.org */ // 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 "); } } ?> Appendix -------------- Description: 1. files that have been compressed are cached on the server. access the files again to reduce the compression time and reduce the CPU usage. 2. you can set the client file cache time to reduce the number of re-requests by more than 85%. 3. because the image is already in the compression format, it only sets the client cache time and does not compress the image. Usage: 1. the server must support the gzip and Rewrite functions. 2. add the following code in the line below "RewriteBase/" of the htacess File: RewriteRule (. *. css $ |. *. js $ |. *. jpg $ |. *. gif $ |. *. png $) gzip. php? $1 [L] 3. Upload gzip. php to the root directory 4. create a cache folder in the root directory to ensure read/write.