How to enable gzip compression in a PHP virtual host

Define (' Abspath ', DirName (__file__). ' /'); $cache = true;//gzip compression switch $cachedir = ' gzip_cache/';//directory where GZ files are stored, created before use, and given writable permissions $gzip = strstr ($_server[' http_accept_encoding '), ' gzip '); $deflate = strstr ($_server[' http_accept_encoding '), ' deflate '); $encoding = $gzip? ' gzip ': ($deflate? ' Deflate ': ' None '); if (!isset ($_server[' query_string ')) exit (); $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 ';//cache path $type = "content-type:text/html"; MIME Information $ext = Array_pop (Explode ('. ', $filename));//Get the file name extension Switch ($ext) {//update MIME information Case ' CSS ': $type = "Content-type:text/css"; Break Case ' JS ': $type = "Content-type:text/javascript"; Break Default Exit (); } if ($cache) { if (file_exists ($cache _filename)) {//If there is a GZ file $mtime = Filemtime ($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 ')) = = = $gmt _mtime) ){ Returns 304 if the file is not changed Header ("http/1.1 304 not Modified"); Header ("Expires:"); Header ("Cache-control:"); Header ("Pragma:"); Header ($type); Header ("Tips:cache not Modified (Gzip)"); Header (' content-length:0 '); }else{ Read GZ file output $content = file_get_contents ($cache _filename); Header ("last-modified:".) $gmt _mtime); Header ("Expires:"); Header ("Cache-control:"); Header ("Pragma:"); Header ($type); Header ("Tips:normal Respond (Gzip)"); Header ("Content-encoding:gzip"); Echo $content; } }else if (file_exists ($filename)) {//does not have a corresponding GZ file $mtime = Mktime (); $gmt _mtime = gmdate (' d, D M Y h:i:s ', $mtime). ' GMT '; $content = file_get_contents ($filename); $content = Gzencode ($content, 9, $gzip? force_gzip:force_deflate);//compressed content Header ("last-modified:".) $gmt _mtime); Header ("Expires:"); Header ("Cache-control:"); Header ("Pragma:"); Header ($type); Header ("Tips:build gzip File (gzip)"); Header ("content-encoding:".) $encoding); Header (' Content-length: '. strlen ($content)); Echo $content; if ($fp = fopen ($cache _filename, ' W ')) {//write cache Fwrite ($fp, $content); Fclose ($FP); } }else{ Header ("http/1.0 404 Not Found"); } }else{//Turn off gzip compression by bbs.it-home.org 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 ')) = = = $gmt _mtime) ){ Header ("http/1.1 304 not Modified"); Header ("Expires:"); Header ("Cache-control:"); Header ("Pragma:"); Header ($type); Header ("Tips:cache not Modified"); Header (' content-length:0 '); }else{ Header ("last-modified:".) $gmt _mtime); Header ("Expires:"); Header ("Cache-control:"); Header ("Pragma:"); Header ($type); Header ("Tips:normal Respond"); $content = ReadFile ($filename); Echo $content; } }else{ Header ("http/1.0 404 Not Found"); } } ?> Copy Code Next, add the following rule in. htaccess (Apache mod_rewrite) or Httpd.ini (IIS isapi_rewrite): Rewriterule (. *.css$|. *.js$)/gzip.php\?$1 [L] Copy Code Finally, the test is performed. Visit each page of the site to see if there is a cache file generation in the Gzip_cache folder. You can also use Baidu Webmaster tools, you can see whether the Css/js page compression.

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