include_once("mime.inc");
$mm = new MIME();
$to = "customer@263.net";
$subject = $mm->encode("商城","gb2312"); // 编码
$msg = "注册会员成功
";
$msg .= "会员名:wayne
";
$msg .= "密码:wayne";
$headers = "From: webmaster@263.net
Content-Type: text/html; charset=gb2312
";
mail("$to", "$subject", "$msg", "$headers");
?>
进行编码以后,中文问题解决。