php gizp压缩传输js和css文件 – PHP

实例：

<?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<a href="http://www.sharetk.com/" target="_blank"><u>网站</u></a>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<a href="http://www.sharetk.com/" target="_blank"><u>网站</u></a>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<a href="http://www.sharetk.com/" target="_blank"><u>浏览器</u></a>
 **/
$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);
///////////////http://blog.ddian.cn
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);
        }
    }
}

源于：http://www.sharetk.com/html/code/php/7707.html