function isMobile() {
	// 如果有HTTP_X_WAP_PROFILE则一定是移动设备
	if (isset ($_SERVER['HTTP_X_WAP_PROFILE']))
	        return true;
	//此条摘自TPM智能切换模板引擎，适合TPM开发
	if(isset ($_SERVER['HTTP_CLIENT']) &&'PhoneClient'==$_SERVER['HTTP_CLIENT'])
	        return true;
	//如果via信息含有wap则一定是移动设备,部分服务商会屏蔽该信息
	if (isset ($_SERVER['HTTP_VIA']))
	        //找不到为flase,否则为true
	return stristr($_SERVER['HTTP_VIA'], 'wap') ? true : false;
	//判断手机发送的客户端标志,兼容性有待提高
	if (isset ($_SERVER['HTTP_USER_AGENT'])) {
		$clientkeywords = array(
		            'nokia','sony','ericsson','mot','samsung','htc','sgh','lg','sharp','sie-','philips','panasonic','alcatel','lenovo','iphone','ipod','blackberry','meizu','android','netfront','symbian','ucweb','windowsce','palm','operamini','operamobi','openwave','nexusone','cldc','midp','wap','mobile'
		        );
		//从HTTP_USER_AGENT中查找手机浏览器的关键字
		if (preg_match("/(" . implode('|', $clientkeywords) . ")/i", strtolower($_SERVER['HTTP_USER_AGENT']))) {
			return true;
		}
	}
	//协议法，因为有可能不准确，放到最后判断
	if (isset ($_SERVER['HTTP_ACCEPT'])) {
		// 如果只支持wml并且不支持html那一定是移动设备
		// 如果支持wml和html但是wml在html之前则是移动设备
		if ((strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') !== false) && (strpos($_SERVER['HTTP_ACCEPT'], 'text/html') === false || (strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') < strpos($_SERVER['HTTP_ACCEPT'], 'text/html')))) {
			return true;
		}
	}
	return false;
}