php使用gzip压缩传输js和css文件的方法_php技巧

<?php  /**   * 完整调用示例:   * 1、combine.php?t=j&b=public&fs=jslib.jquery,function   *    * 该例子调用的是网站根目录下的public/jslib/jquery.js和public/function.js   *    * 2、combine.php?t=j&fs=jslib.jquery,function   *    * 该例子调用的是网站根目录下的jslib/jquery.js和function.js   *    * 3、combine.php?t=c&b=public.css&fs=common,index   *    * 该例子调用的是网站根目录下的public/css/common.css和public/css/index.css   *    * 4、combine.php?t=c&fs=css.common   * 该例子调用的是网站根目录下的css/common.css   *    * 注:多个文件名之间用,分隔;只有一个文件名最后不要有,   *   用,分隔的多个文件会被压缩进一个文件，一次性传给浏览器   **/  $is_bad_request=false;  $cache = true;  $doc_root_uri=$_SERVER['DOCUMENT_ROOT'].'/';  $cachedir = $doc_root_uri . 'public/cache';  //文件类型，j为js，c为css  $type=isset($_GET['t'])?($_GET['t']=='j'||$_GET['t']=='c'?$_GET['t']:''):'';  //存放js和css文件的基目录, 例如:?b=public.js 代表的是/public/js文件夹，出发点是网站根目录  //基目录参数不是必须的，如果有基目录那么这个基目录就会附加在文件名之前  $base =isset($_GET['b'])?($doc_root_uri.str_replace('.','/',$_GET['b'])):$doc_root_uri;  //文件名列表，文件名不带后缀名.比如基目录是  //文件名的格式是 :基目录(如果有)+文件包名+文件名  //例如:类型是j,  //   文件名public.js.jquery  //   如果有基路径且为public，  //   那么转换后的文件名就是/public/public/js/jquery.js  //   如果没有基路径  //   那么转换后的文件名就是/public/js/jquery.js  //多个文件名之间用,分隔  $fs=isset($_GET['fs'])?str_replace('.','/',$_GET['fs']):'';  $fs=str_replace(',','.'.($type=='j'?'js,':'css,'),$fs);  $fs=$fs.($type=='j'?'.js':'.css');  if($type==''||$fs==''){$is_bad_request=true;}  //die($base);  if($is_bad_request){header ("HTTP/1.0 503 Not Implemented");}  $file_type=$type=='j'?'javascript':'css';  $elements = explode(',',preg_replace('/([^?]*).*/', '/1', $fs));  // Determine last modification date of the files  $lastmodified = 0;  while (list(,$element) = each($elements)) {    $path =$base . '/' . $element;    if (($type == 'j' && substr($path, -3) != '.js') ||       ($type == 'c' && substr($path, -4) != '.css')) {      header ("HTTP/1.0 403 Forbidden");      exit;      }    if (substr($path, 0, strlen($base)) != $base || !file_exists($path)) {      header ("HTTP/1.0 404 Not Found");      exit;    }    $lastmodified = max($lastmodified, filemtime($path));  }  // Send Etag hash  $hash = $lastmodified . '-' . md5($fs);  header ("Etag: /"" . $hash . "/"");  if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&     stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) == '"' . $hash . '"')   {    // Return visit and no modifications, so do not send anything    header ("HTTP/1.0 304 Not Modified");    header ("Content-Type: text/" . $file_type);    header ('Content-Length: 0');  }   else  {    // First time visit or files were modified    if ($cache)     {      // Determine supported compression method      $gzip = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip');      $deflate = strstr($_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate');      // Determine used compression method      $encoding = $gzip ? 'gzip' : ($deflate ? 'deflate' : 'none');      // Check for buggy versions of Internet Explorer      if (!strstr($_SERVER['HTTP_USER_AGENT'], 'Opera') &&         preg_match('/^Mozilla//4/.0 /(compatible; MSIE ([0-9]/.[0-9])/i', $_SERVER['HTTP_USER_AGENT'], $matches)) {        $version = floatval($matches[1]);        if ($version < 6)          $encoding = 'none';        if ($version == 6 && !strstr($_SERVER['HTTP_USER_AGENT'], 'EV1'))           $encoding = 'none';      }      // Try the cache first to see if the combined files were already generated      $cachefile = 'cache-' . $hash . '.' . $file_type . ($encoding != 'none' ? '.' . $encoding : '');      if (file_exists($cachedir . '/' . $cachefile)) {        if ($fp = fopen($cachedir . '/' . $cachefile, 'rb')) {          if ($encoding != 'none') {            header ("Content-Encoding: " . $encoding);          }          header ("Content-Type: text/" . $file_type);          header ("Content-Length: " . filesize($cachedir . '/' . $cachefile));          fpassthru($fp);          fclose($fp);          exit;        }      }    }    // Get contents of the files    $contents = '';    reset($elements);    while (list(,$element) = each($elements)) {      $path = $base . '/' . $element;      $contents .= "/n/n" . file_get_contents($path);    }    // Send Content-Type    header ("Content-Type: text/" . $file_type);    if (isset($encoding) && $encoding != 'none')     {      // Send compressed contents      $contents = gzencode($contents, 9, $gzip ? FORCE_GZIP : FORCE_DEFLATE);      header ("Content-Encoding: " . $encoding);      header ('Content-Length: ' . strlen($contents));      echo $contents;    }     else    {      // Send regular contents      header ('Content-Length: ' . strlen($contents));      echo $contents;    }    // Store cache    if ($cache) {      if ($fp = fopen($cachedir . '/' . $cachefile, 'wb')) {        fwrite($fp, $contents);        fclose($fp);      }    }  }

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