隨著移動設備的普及，網站也會迎來越來越多移動設備的訪問。用適應PC的頁面，很多時候對手機用戶不友好，那么有些時候，我們需要判斷用戶是否用手機訪問，如果是手機的話，就跳轉到指定的手機友好頁面。這里就介紹一下，如何判斷用戶是否用手機訪問。

自定義的函數如下：

// check if wapfunction check_wap(){	// 先檢查是否為wap代理，準確度高	if(stristr($_SERVER['HTTP_VIA'],"wap")){		return true;	}	// 檢查瀏覽器是否接受 WML.	elseif(strpos(strtoupper($_SERVER['HTTP_ACCEPT']),"VND.WAP.WML") > 0){		return true;   }   //檢查USER_AGENT   elseif(preg_match('/(blackberry|configuration//cldc|hp |hp-|htc |htc_|htc-|iemobile|kindle|midp|mmp|motorola|mobile|nokia|opera mini|opera |Googlebot-Mobile|YahooSeeker//M1A1-R2D2|android|iphone|ipod|mobi|palm|palmos|pocket|portalmmm|ppc;|smartphone|sonyericsson|sqh|spv|symbian|treo|up.browser|up.link|vodafone|windows ce|xda |xda_)/i', $_SERVER['HTTP_USER_AGENT'])){		return true;	}	else{		return false;   }}

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;}

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