PHP判断是否是移动设备访问

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;}