Эта функция позволяет с высокой вероятностью определить зашли ли с мобильного телефона или с обычного компьютера.
function detect_mobile_device(){
// check if the user agent value claims to be windows but not windows mobile
if(stristr(@$_SERVER['HTTP_USER_AGENT'],'windows')&&!stristr(@$_SERVER['HTTP_USER_AGENT'],'windows ce')) return false;
// check if the user agent gives away any tell tale signs it's a mobile browser
if(preg_match('/up.browser|up. link |windows ce|iemobile|mini|mmp|symbian|midp|wap|phone|pocket|mobile|pda|psp/i',
@$_SERVER['HTTP_USER_AGENT'])) return true;
// check the http accept header to see if wap.wml or wap.xhtml support is claimed
if(isset($_SERVER['HTTP_ACCEPT'])&&(stristr($_SERVER['HTTP_ACCEPT'],'text/vnd.wap.wml')||
stristr($_SERVER['HTTP_ACCEPT'],'application/vnd.wap.xhtml xml'))) return true;
// check if there are any tell tales signs it's a mobile device from the server headers
if(isset($_SERVER['HTTP_X_WAP_PROFILE'])||isset($_SERVER['HTTP_PROFILE'])||
isset($_SERVER['X-OperaMini-Features'])||isset($_SERVER['UA-pixels'])) return true;
// build an array with the first four characters from the most common mobile user agents
$a = array ('acs-','alav','alca','amoi','audi','aste','avan','benq','bird','blac',
'bla z','brew','cell','cldc','cmd-','dang','doco','eric','hipt','inno',
'ipaq','java', 'jigs','kddi','keji','leno','lg-c','lg-d','lg-g','lge-',
'maui','maxo','midp','mi ts','mmef','mobi','mot-','moto','mwbp','nec-',
'newt','noki','opwv','palm','pana' ,'pant','pdxg','phil','play','pluc',
'port','prox','qtek','qwap','sage','sams','s any','sch-','sec-','send',
'seri','sgh-','shar','sie-','siem','smal','smar','sony ','sph-','symb',
't-mo','teli','tim-','tosh','tsm-','upg1','upsi','vk-v','voda',' w3c ',
'wap-','wapa','wapi','wapp','wapr','webc','winw','winw','xda','xda-');
// check if the first four characters of the current user agent are set as a key in the array
if(isset($a[ substr (@$_SERVER['HTTP_USER_AGENT'],0,4)])) return true;
}
if (detect_mobile_device())echo "<h4>Вы зашли с мобильного телефона!</h4>";
else echo "<div class='res'><h4>Вы зашли с обычного компьютера.</h4></div>";
Функция определения вида и версии браузера, а также типа операционной системы пользователя здесь
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