function isMobile(){     // 如果有HTTP_X_WAP_PROFILE則一定是移動裝置    if (isset ($_SERVER['HTTP_X_WAP_PROFILE'])){return true;    }     // 如果via資訊含有wap則一定是移動裝置,部分服務商會遮蔽該資訊    if (isset ($_SERVER['HTTP_VIA'])){ // 找不到為flase,否則為truereturn stristr($_SERVER['HTTP_VIA'], "wap") ? true : false;    }     // 腦殘法，判斷手機發送的客戶端標誌,相容性有待提高    if (isset ($_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'); // 從HTTP_USER_AGENT中查詢手機瀏覽器的關鍵字if (preg_match("/(" . implode('|', $clientkeywords) . ")/i",strtolower($_SERVER['HTTP_USER_AGENT']))){   return true;}     }     // 協議法，因為有可能不準確，放到最後判斷    if (isset ($_SERVER['HTTP_ACCEPT'])){ // 如果只支援wml並且不支援html那一定是移動裝置// 如果支援wml和html但是wml在html之前則是移動裝置if ((strpos($_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;}