PHP教程
function ismobile() {
 // 如果有HTTP_X_WAP_PROFILE則一定是移動設備
 if (isset ($_SERVER['HTTP_X_WAP_PROFILE']))
 return true;
 
 //此條摘自TPM智能切換模板引擎,適合TPM開發
 if(isset ($_SERVER['HTTP_CLIENT']) &&'PhoneClient'==$_SERVER['HTTP_CLIENT'])
 return true;
 //如果via信息含有wap則一定是移動設備,部分服務商會屏蔽該信息
 if (isset ($_SERVER['HTTP_VIA']))
 //找不到為flase,否則為true
 return stristr($_SERVER['HTTP_VIA'], 'wap') ? true : false;
 //判斷手機發送的客戶端標志,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'
 );
 //從HTTP_USER_AGENT中查找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,放到最后判斷
 if (isset ($_SERVER['HTTP_ACCEPT'])) {
 // 如果只支持wml并且不支持html那一定是移動設備
 // 如果支持wml和html但是wml在html之前則是移動設備
 if ((strpos($_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;
 }

PHP教程
Class CommonAction extends Action{
 Public function _initialize(){
 //移動設備瀏覽,則切換模板
 if (ismobile()) {
  //設置默認默認主題為 Mobile
  C('DEFAULT_THEME','Mobile');
 }
 //............你的更多代碼.......
 }
 }