不知道多少人玩过wiki，提个问题，看有人能帮帮忙不？

安装Mediawiki　1.5.8

安装的时候提示了三个警告！谁能给偶解释一下，谢了～

Warning: set_time_limit(): Cannot set time limit in safe mode in d:\efangvhost4.28\hometang\com_5imovies\web\install-utils.inc on line 27

Warning:PHP's register_globals option is enabled. MediaWiki will work correctly, but this setting increases your exposure to potential security vulnerabilities in PHP-based software running on your server. You should disable it if you are able.

Warning: PHP's safe mode is active. You may have problems caused by this, particularly if using image uploads.