php使用gzip压缩传输js和css文件的方法

<"HTTP/1.0 503 Not Implemented");}
  $file_type=$type=='j'"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 "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 "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);
      }
    }
  }