今天安装了多个网站后台管理系统，但无一可运行，简直崩溃。问题出在安装成功后，登陆后台出现空白现象。经过网上查找资料，原来是php版本问题。php5.4移除了session_register这个函数。版本里说明，继续使用该函数会产生错误。

解决办法：

找include/userlogin.class.php里面的keepuser()函数，

把@session_register 全部改写， 虽然不知道这个@是什么意思

把@session_register($this->keepUserIDTag);    注释掉，然后改为

if (!isset($_SESSION[$this->keepUserIDTag]))

全部有6个。

if (!isset($_SESSION[$this->keepUserIDTag]))//@session_register($this->keepUserIDTag);$_SESSION[$this->keepUserIDTag] = $this->userID;if (!isset($_SESSION[$this->keepUserTypeTag]))//@session_register($this->keepUserTypeTag);$_SESSION[$this->keepUserTypeTag] = $this->userType;if (!isset($_SESSION[$this->keepUserChannelTag]))//@session_register($this->keepUserChannelTag);$_SESSION[$this->keepUserChannelTag] = $this->userChannel;if (!isset($_SESSION[$this->keepUserNameTag]))//@session_register($this->keepUserNameTag);$_SESSION[$this->keepUserNameTag] = $this->userName;if (!isset($_SESSION[$this->keepUserPurviewTag]))//@session_register($this->keepUserPurviewTag);$_SESSION[$this->keepUserPurviewTag] = $this->userPurview;if (!isset($_SESSION[$this->keepAdminStyleTag]))//@session_register($this->keepAdminStyleTag);$_SESSION[$this->keepAdminStyleTag] = $adminstyle;

安装网站时，需要重新安装时，可以修改一下：在install目录下，把index.php.bak 的bak后缀去掉，install_lock.txt 删掉。重新在浏览器上输入相关安装目录即可重新安装。