thinkphp中怎么判断是手机端访问还是pc端访问?

 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;

     // 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;

     }

     // 脑残法，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;//则return false;

  }