.net及php判断手机还是电脑访问网站

asp.net(C#) 中用以下代码
using System.Text.RegularExpressions;//头部引入正则的命名空间

//为了加强准确性，防止支持wap的浏览器如opera，加入操作系统验证。openwave|后为pc操作系统
string osPat = "mozilla|m3gate|winwap|openwave|Windows NT|Windows 3.1|95|Blackcomb|98|ME|X Window|Longhorn|ubuntu|AIX|Linux|AmigaOS|BEOS|HP-UX|OpenBSD|FreeBSD|NetBSD|OS/2|OSF1|SUN";
string uAgent = Request.ServerVariables["HTTP_USER_AGENT"];
Regex reg = new Regex(osPat);
if (reg.IsMatch(uAgent))
{
Response.Write("电脑访问");
}
else
{
Response.Write("手机访问");
}
Response.Write("<br/>" + uAgent);

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PHP中用以下代码:
$uAgent = $_SERVER['HTTP_USER_AGENT'];
$osPat = "mozilla|m3gate|winwap|openwave|Windows NT|Windows 3.1|95|Blackcomb|98|ME|X Window|ubuntu|Longhorn|AIX|Linux|AmigaOS|BEOS|HP-UX|OpenBSD|FreeBSD|NetBSD|OS\/2|OSF1|SUN";
if(preg_match("/($osPat)/i", $uAgent )) //winwap 模拟WAP手机上网的一个浏览器; openwave|后面为各pc操作系统
{
echo "电脑访问";
}
else
{
echo "手机访问";
}
echo '<br/>'.$uAgent;

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javascript中采用navigator.userAgent 来获取，但非智能机似乎不支持js。