Study PHP Skills, Share PHP Code

The most efficient way to detect mobile phones with PHP, this simply queries the accept headers, the user agent and checks for any tell tale signs that the browser we’re sniffing is a mobile device.

[php]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(eregi(’up.browser|up.link|windows ce|iemobile|mini|mmp|symbian|midp|wap|phone|pocket|mobile|pda|psp’,$_SERVER[’HTTP_USER_AGENT’])){
return true;
}
// check the http accept header to see if wap.wml or wap.xhtml support is claimed
if(stristr($_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
$a = array(’acs-’,’alav’,’alca’,’amoi’,’audi’,’aste’,’avan’,’benq’,’bird’,’blac’,’blaz’,’brew’,’cell’,’cldc’,’cmd-’,’dang’,’doco’,’eric’,’hipt’,’inno’,’ipaq’,’java’,’jigs’,’kddi’,’keji’,’leno’,’lg-c’,’lg-d’,’lg-g’,’lge-’,’maui’,’maxo’,’midp’,’mits’,’mmef’,’mobi’,’mot-’,’moto’,’mwbp’,’nec-’,’newt’,’noki’,’opwv’,’palm’,’pana’,’pant’,’pdxg’,’phil’,’play’,’pluc’,’port’,’prox’,’qtek’,’qwap’,’sage’,’sams’,’sany’,’sch-’,’sec-’,’send’,’seri’,’sgh-’,’shar’,’sie-’,’siem’,’smal’,’smar’,’sony’,’sph-’,’symb’,’t-mo’,’teli’,’tim-’,’tosh’,’tsm-’,’upg1′,’upsi’,’vk-v’,’voda’,’w3c ‘,’wap-’,’wapa’,’wapi’,’wapp’,’wapr’,’webc’,’winw’,’winw’,’xda’,’xda-’);
// check if the first four characters of the current user agent are set as a key in the array
if(isset($a[substr($_SERVER[’HTTP_USER_AGENT’],0,4)])){
return true;
}
}

// example 1 – detect and redirect mobile browsers
if(detect_mobile_device()){
header(’Location: http://andymoore.mobi/’);
exit;
}

// example 2 – detect and redirect desktop browsers
if(!detect_mobile_device()){
header(’Location: http://andymoore.info/’);
exit;
}[/php]