判断是不是手机设备

	//判断是不是手机设备
	function is_mobile_request()  
	{  
		 $_SERVER['ALL_HTTP'] = isset($_SERVER['ALL_HTTP']) ? $_SERVER['ALL_HTTP'] : '';  
		 $mobile_browser = '0';  
		 if(preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone|iphone|ipad|ipod|android|xoom)/i', strtolower($_SERVER['HTTP_USER_AGENT'])))  
		 	 $mobile_browser++;  
		 if((isset($_SERVER['HTTP_ACCEPT'])) and (strpos(strtolower($_SERVER['HTTP_ACCEPT']),'application/vnd.wap.xhtml+xml') !== false))  
		  	$mobile_browser++;  
		 if(isset($_SERVER['HTTP_X_WAP_PROFILE']))  
		  	$mobile_browser++;  
		 if(isset($_SERVER['HTTP_PROFILE']))  
		  $mobile_browser++;  
		 $mobile_ua = strtolower(substr($_SERVER['HTTP_USER_AGENT'],0,4));  
		 $mobile_agents = array(  
			'w3c ','acs-','alav','alca','amoi','audi','avan','benq','bird','blac',  
			'blaz','brew','cell','cldc','cmd-','dang','doco','eric','hipt','inno',  
			'ipaq','java','jigs','kddi','keji','leno','lg-c','lg-d','lg-g','lge-',  
			'maui','maxo','midp','mits','mmef','mobi','mot-','moto','mwbp','nec-',  
			'newt','noki','oper','palm','pana','pant','phil','play','port','prox',  
			'qwap','sage','sams','sany','sch-','sec-','send','seri','sgh-','shar',  
			'sie-','siem','smal','smar','sony','sph-','symb','t-mo','teli','tim-',  
			'tosh','tsm-','upg1','upsi','vk-v','voda','wap-','wapa','wapi','wapp',  
			'wapr','webc','winw','winw','xda','xda-'
			);  
		 if(in_array($mobile_ua, $mobile_agents))  
		  $mobile_browser++;  
		 if(strpos(strtolower($_SERVER['ALL_HTTP']), 'operamini') !== false)  
		  $mobile_browser++;  
		 // Pre-final check to reset everything if the user is on Windows  
		 if(strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'windows') !== false)  
		  $mobile_browser=0;  
		 // But WP7 is also Windows, with a slightly different characteristic  
		 if(strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'windows phone') !== false)  
		  $mobile_browser++;  
		 if($mobile_browser>0)  
		  return true;  
		 else
		  return false;
	 }