For catching mobile browsers, it's caught every mobile browser I've thrown at it... 3 real ones (Palm Blazer, Opera Mini, Google's web to plain old text converter) and 2 simulated ones (Sony K750, Nokia N70). It also scored 94.34% against a database of 6,788 mobile browser User Agent ID codes via the WURFL database. And since its WURFL score was only based on one of three different tests the script does, and the ones it wasn't catching were from more obscure browsers, I'd estimate this little chunk of code should be able to identify 97% of mobile visitors, if not more.
if(isset($_SERVER["HTTP_X_WAP_PROFILE"])) return true;
if(preg_match("/wap\.|\.wap/i",$_SERVER["HTTP_ACCEPT"])) return true;
if(isset($_SERVER["HTTP_USER_AGENT"])){
$uamatches = array("midp", "j2me", "avantg", "docomo", "novarra", "palmos", "palmsource", "240x320", "opwv", "chtml", "pda", "windows\ ce", "mmp\/", "blackberry", "mib\/", "symbian", "wireless", "nokia", "hand", "mobi", "phone", "cdm", "up\.b", "audio", "SIE\-", "SEC\-", "samsung", "HTC", "mot\-", "mitsu", "sagem", "sony", "alcatel", "lg", "eric", "vx", "NEC", "philips", "mmm", "xx", "panasonic", "sharp", "wap", "sch", "rover", "pocket", "benq", "java", "pt", "pg", "vox", "amoi", "bird", "compal", "kg", "voda", "sany", "kdd", "dbt", "sendo", "sgh", "gradi", "jb", "\d\d\di", "moto");
foreach($uamatches as $uastring){
if(preg_match("/".$uastring."/i",$_SERVER["HTTP_USER_AGENT"])) return true;
}
}
return false;
}
It's pretty simple. Line 1 of the function checks to see if the browser is sending a WAP profile. No desktop browser would want or need to, and based on my testing, none do. OTOH, Blazer on my Treo 700p sends one, but Opera Mini doesn't, so it's far from the only test needed.
The second line looks for WAP formats in the HTTP Accept string, which tells the server the types of content the browser can accept.
The rest of the code checks the User Agent ID for bits of text that you'll find in mobile browser IDs but not in the IDs of major desktop browsers. Each of these text snippets are meaningful indicators pulled from real PDA and mobile phone User Agent IDs.
