phpcms判断是否为手机

/**
 * Function isMobile
  * @param $n 判断手机版
 */
 function isMobile(){  
 	$useragent=isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';  
 	$useragent_commentsblock=preg_match('|(.*?)|',$useragent,$matches)>0?$matches[0]:'';     
 	function CheckSubstrs($substrs,$text){    
 		foreach($substrs as $substr)     
 			if(false!==strpos($text,$substr)){      
 				return true;     
 			}     
 			return false;  
 		}
 	$mobile_os_list=array('Google Wireless Transcoder','Windows CE','WindowsCE','Symbian','Android','armv6l','armv5','Mobile','CentOS','mowser','AvantGo','Opera Mobi','J2ME/MIDP','Smartphone','Go.Web','Palm','iPAQ');
 	$mobile_token_list=array('Profile/MIDP','Configuration/CLDC-','160×160','176×220','240×240','240×320','320×240','UP.Browser','UP.Link','SymbianOS','PalmOS','PocketPC','SonyEricsson','Nokia','BlackBerry','Vodafone','BenQ','Novarra-Vision','Iris','NetFront','HTC_','Xda_','SAMSUNG-SGH','Wapaka','DoCoMo','iPhone','iPod');  
 	$found_mobile=CheckSubstrs($mobile_os_list,$useragent_commentsblock) || CheckSubstrs($mobile_token_list,$useragent);  
 	if ($found_mobile){    
 		return true;  
 	}else{    
 		return false;  
 	}  
 }