在php虛擬主機中啟用gzip壓縮的方法

define('ABSPATH', dirname(__FILE__).'/');
 $cache = true;//Gzip壓縮開關
$cachedir = 'gzip_cache/';//存放gz檔案的目錄，使用前創建，並賦予可寫入權限
$gzip = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip');
$deflate = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate');
$encoding = $gzipicoding ' gzip' : ($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';//快取路徑
$type="Content-type: text /html"; //MIME資訊
$ext = array_pop(explode('.', $filename));//取得檔案副檔名
switch ($ext){/ /更新MIME資訊
 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)){//假如存在gz檔

 $mtime = filemtime($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_SINCg')dFIED_SINCg_mtVERm 🎜> ){

 // 若檔案無變動，回傳304
 header ("HTTP/1.1 304 Not Modified");
 header("Expires: ");
 header(> header(> header(> header(> header(> header(> header(> header(>) "Cache-Control: ");
 header("Pragma: ");
 header($type);
 header("Tips: Cache Not Modified (Gzip)");
 header ( 'Content-Length: 0');
 }else{
 //讀取gz檔輸出
 $content = file_get_contents($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)){ //沒有對應的gz檔
 $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);//壓縮內容

 header("Last-Modified:" . $gmt_mtime);
 header("Expires: ");
 header("Expires: ");
 header("Expires: ");
 header("Expires: ");
 header("Expires: ");
 header(" Cache-Control: ");
 header("Pragma: ");
 header($type);
 header("Tips: Build Gzip File (Gzip)");
 header (" Content-Encoding: " . $encoding);
 header ('Content-Length: ' . strlen($content));
 echo $content;
 if ($fp = fopen($cache_filename, 'w')) {//寫入快取
 fwrite($fp, $content);
 fclose($fp);
 }
 }else{
 header("HTTP/1.0 404 Not Found");
 }
}else{ //關閉Gzip壓縮
//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(';', $_SERVER['HTTP_IF_MODIFIED_SINCE'])) ===g; 🎜>
 header ("HTTP/1.1 304 Not Modified");
 header("Expires: ");
 header("Cache-Control: ");
 header("Pmarag: " );
 header($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");
 }
}
?>

複製程式碼

接著，在.htaccess(Apache mod_rewrite)或httpd.ini(IIS ISAPI_Rewrite)中加入以下規則：

RewriteRule (.*.css$|.*.js$) /gzip.php?$1 [L]

最後，進行測試。 造訪網站的各個頁面，看看gzip_cache資料夾中是否有快取檔案產生。 也可以用百度站長工具，可以看到css/js頁面是否壓縮。