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php gizp压缩传输js和css文件

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May 25, 2016 pm 05:07 PM

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<?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[&#39;DOCUMENT_ROOT&#39;].&#39;/&#39;;
    $cachedir = $doc_root_uri . &#39;public/cache&#39;;
    //文件类型，j为js，c为css
    $type=isset($_GET[&#39;t&#39;])?($_GET[&#39;t&#39;]==&#39;j&#39;||$_GET[&#39;t&#39;]==&#39;c&#39;?$_GET[&#39;t&#39;]:&#39;&#39;):&#39;&#39;;
     
    //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[&#39;b&#39;])?($doc_root_uri.str_replace(&#39;.&#39;,&#39;/&#39;,$_GET[&#39;b&#39;])):$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[&#39;fs&#39;])?str_replace(&#39;.&#39;,&#39;/&#39;,$_GET[&#39;fs&#39;]):&#39;&#39;;
    $fs=str_replace(&#39;,&#39;,&#39;.&#39;.($type==&#39;j&#39;?&#39;js,&#39;:&#39;css,&#39;),$fs);
    $fs=$fs.($type==&#39;j&#39;?&#39;.js&#39;:&#39;.css&#39;);
     
     
     
    if($type==&#39;&#39;||$fs==&#39;&#39;){$is_bad_request=true;}
    //die($base);
    ///////////////http://blog.ddian.cn
    if($is_bad_request){header ("HTTP/1.0 503 Not Implemented");}
     
     
    $file_type=$type==&#39;j&#39;?&#39;javascript&#39;:&#39;css&#39;;
     
    $elements = explode(&#39;,&#39;,preg_replace(&#39;/([^?]*).*/&#39;, &#39;\1&#39;, $fs));
     
    // Determine last modification date of the files
    $lastmodified = 0;
    while (list(,$element) = each($elements)) {
        $path =$base . &#39;/&#39; . $element;
     
        if (($type == &#39;j&#39; && substr($path, -3) != &#39;.js&#39;) || 
            ($type == &#39;c&#39; && substr($path, -4) != &#39;.css&#39;)) {
            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 = $lastmodified . &#39;-&#39; . md5($fs);
    header ("Etag: \"" . $hash . "\"");
     
    if (isset($_SERVER[&#39;HTTP_IF_NONE_MATCH&#39;]) && 
        stripslashes($_SERVER[&#39;HTTP_IF_NONE_MATCH&#39;]) == &#39;"&#39; . $hash . &#39;"&#39;) 
    {
        // Return visit and no modifications, so do not send anything
        header ("HTTP/1.0 304 Not Modified");
        header ("Content-Type: text/" . $file_type);
        header (&#39;Content-Length: 0&#39;);
    } 
    else
    {
        // First time visit or files were modified
        if ($cache) 
        {
            // Determine supported compression method
            $gzip = strstr($_SERVER[&#39;HTTP_ACCEPT_ENCODING&#39;], &#39;gzip&#39;);
            $deflate = strstr($_SERVER[&#39;HTTP_ACCEPT_ENCODING&#39;], &#39;deflate&#39;);
     
            // Determine used compression method
            $encoding = $gzip ? &#39;gzip&#39; : ($deflate ? &#39;deflate&#39; : &#39;none&#39;);
     
            // Check for buggy versions of Internet Explorer
            if (!strstr($_SERVER[&#39;HTTP_USER_AGENT&#39;], &#39;Opera&#39;) && 
                preg_match(&#39;/^Mozilla\/4\.0 \(compatible; MSIE ([0-9]\.[0-9])/i&#39;, $_SERVER[&#39;HTTP_USER_AGENT&#39;], $matches)) {
                $version = floatval($matches[1]);
                 
                if ($version < 6)
                    $encoding = &#39;none&#39;;
                     
                if ($version == 6 && !strstr($_SERVER[&#39;HTTP_USER_AGENT&#39;], &#39;EV1&#39;)) 
                    $encoding = &#39;none&#39;;
            }
             
            // Try the cache first to see if the combined files were already generated
            $cachefile = &#39;cache-&#39; . $hash . &#39;.&#39; . $file_type . ($encoding != &#39;none&#39; ? &#39;.&#39; . $encoding : &#39;&#39;);
             
            if (file_exists($cachedir . &#39;/&#39; . $cachefile)) {
                if ($fp = fopen($cachedir . &#39;/&#39; . $cachefile, &#39;rb&#39;)) {
 
                    if ($encoding != &#39;none&#39;) {
                        header ("Content-Encoding: " . $encoding);
                    }
                 
                    header ("Content-Type: text/" . $file_type);
                    header ("Content-Length: " . filesize($cachedir . &#39;/&#39; . $cachefile));
                    fpassthru($fp);
                    fclose($fp);
                    exit;
                }
            }
        }
     
        // Get contents of the files
        $contents = &#39;&#39;;
        reset($elements);
        while (list(,$element) = each($elements)) {
            $path = $base . &#39;/&#39; . $element;
            $contents .= "\n\n" . file_get_contents($path);
        }
     
        // Send Content-Type
        header ("Content-Type: text/" . $file_type);
         
        if (isset($encoding) && $encoding != &#39;none&#39;) 
        {
            // Send compressed contents
            $contents = gzencode($contents, 9, $gzip ? FORCE_GZIP : FORCE_DEFLATE);
            header ("Content-Encoding: " . $encoding);
            header (&#39;Content-Length: &#39; . strlen($contents));
            echo $contents;
        } 
        else
        {
            // Send regular contents
            header (&#39;Content-Length: &#39; . strlen($contents));
            echo $contents;
        }
 
        // Store cache
        if ($cache) {
            if ($fp = fopen($cachedir . &#39;/&#39; . $cachefile, &#39;wb&#39;)) {
                fwrite($fp, $contents);
                fclose($fp);
            }
        }
    }   

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