如何在PHP中处理登录注销会话和gcache？

我使用gcache将整个网站页面缓存为HTML，然后我只读取它并向用户显示。看起来是这样的：

$enableCache = true; 
if ($enableCache)
{
    include("gcache.php");
    $cache = new gCache;
    $cache->folder = "temp/";
    $id = join("", $_GET);
    $id = ereg_replace("[^A-Za-z0-9]", "", $id);
    $cache->contentId=$id;
    $cache->timeout = 5; 
    /* its mean gCache cached the whole page */
    /* so, gcache, decide if he must response the compressed or */
    /* uncompressed cache*/
    $cache->isPage = true; 
    if ($cache->Valid()) {
        echo $cache->content;
        die;
    }
    $cache->capture();
}

而且效果很好。现在我在站点的标题中添加了一个链接“login”。当person单击它时，它会将person重定向到他/她提供信用的子页面，并设置会话参数（在调用session_start之前）：

此人将被重定向到mysite.com。但问题是他/她看到了从缓存中获取的站点。所以在右上角有一个“login”，但我设置了当设置了$\u SESSION['theUser']时，它应该显示它并提供一个注销链接。但它不会显示，因为它会返回给用户网站的未登录版本

---

如何解决这个问题？

我认为，以这种方式使用缓存的原因是为了最小化服务器负载和响应时间。但这可以通过更简单的方式实现，不使用第三奇偶性插件/类/东西：

<?php
    global $cachefile;
    //encode cache file name with sha1 
    $cachefilename = sha1($_SERVER['REQUEST_URI']);
    //remove trailing slash
    $cachefile = rtrim(sys_get_temp_dir (),'\\/').DIRECTORY_SEPARATOR.$cachefilename.'.cache';
     // How long to keep cache file?
    $cachetime = 60*5;    //5min
    // Is cache file still fresh? If so, serve it.   
    if (file_exists($cachefile) && filesize($cachefile)>100 && time() - $cachetime < filemtime($cachefile)  )  {
      readfile($cachefile);
      exit;
    }

    function cacheOutputtoFile()   {
     global $cachefile;
     $webpage = ob_get_contents();
     if ($fp = fopen($cachefile, 'w+'))
        {
            // Do an exclusive lock
            if (flock($fp, LOCK_EX))
            { 
               // Truncate file 
               ftruncate($fp, 0); 
               fwrite($fp, $webpage);
               fclose($fp);
            }
        }
    }

    ob_start();
    register_shutdown_function("cacheOutputtoFile");

<?php
    global $cachefile;
    //encode cache file name with sha1 
    $cachefilename = sha1($_SERVER['REQUEST_URI']);
    //remove trailing slash
    $cachefile = rtrim(sys_get_temp_dir (),'\\/').DIRECTORY_SEPARATOR.$cachefilename.'.cache';
     // How long to keep cache file?
    $cachetime = 60*5;    //5min
    // Is cache file still fresh? If so, serve it.   
    if (file_exists($cachefile) && filesize($cachefile)>100 && time() - $cachetime < filemtime($cachefile)  )  {
      readfile($cachefile);
      exit;
    }

    function cacheOutputtoFile()   {
     global $cachefile;
     $webpage = ob_get_contents();
     if ($fp = fopen($cachefile, 'w+'))
        {
            // Do an exclusive lock
            if (flock($fp, LOCK_EX))
            { 
               // Truncate file 
               ftruncate($fp, 0); 
               fwrite($fp, $webpage);
               fclose($fp);
            }
        }
    }

    ob_start();
    register_shutdown_function("cacheOutputtoFile");

require_once("cacheable.php");