//Database setting
$cfg["db"]["host"] = 'localhost';
$cfg["db"]["user"] = 'root';
$cfg["db"]["password"] = 'root';
$cfg["db"]["database"] = 'weblog';

function db_connect()
{
//mysql_connect("localhost","root","root") or die('Cannot connect to database:'.mysql_error());　　　　　------------这句没错，说明用户名什么没错的
//global $cfg["db"]["host"] ,$cfg["db"]["user"],$cfg["db"]["password"],$cfg["db"]["database"] 如果这样还是报错
mysql_connect($cfg["db"]["host"],$cfg["db"]["user"],$cfg["db"]["password"]) or die('Cannot connect to database:'.mysql_error()); //这行报错
mysql_query("SET NAMES UTF8");
mysql_select_db($cfg["db"]["database"]);
}

我用global也没有用啊。。请教这到底是什么为事？