随着移动设备的普及，网站也会迎来越来越多移动设备的访问。用适应pc的页面，很多时候对手机用户不友好，那么有些时候，我们需要判断用户是否用手机访问，如果是手机的话，就跳转到指定的手机友好页面。这里就介绍一下，如何判断用户是否用手机访问。
自定义的函数如下：
$agent = check_wap();
if( $agent )
{
header('location: http://www.jb51.net');
exit;
}
// check if wap
function check_wap(){
// 先检查是否为wap代理，准确度高
if(stristr($_server['http_via'],"wap")){
return true;
}
// 检查浏览器是否接受 wml.
elseif(strpos(strtoupper($_server['http_accept']),"vnd.wap.wml") > 0){
return true;
}
//检查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;
}
}
再来一个从php框架剥离的判断是否为手机移动终端的函数：（经过测试，很全面，推荐使用）
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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