实例讲解PHP实现保存网站用户密码到css文件

<?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($base);
 if($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);
     }
   }
 }