判断是否是手机

public 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; 
		  } 
	}