PHP 判断用户手机浏览器

$useragent = $_GET['osversion'];//navigator.useragent
preg_match_all("/(?:\()(.*)(?:\))/i" , $useragent , $useragentarr);

$osversionarr = explode(')',$useragentarr[1][0]);
$osversioninfo = $osversionarr[0];

if(strstr($osversioninfo,'Mac OS X')){//ios
$osinfoarr = explode(';',$osversioninfo);
$os = 'ios';
$device = $osinfoarr[0];
$deviceinfo = $osinfoarr[1];
}elseif(strstr($osversioninfo,'Android') && strstr($osversioninfo,'Linux')){//安卓
$osinfoarr = explode(';',$osversioninfo);
$os = 'android';
$device = $osinfoarr[1];
$deviceinfo = $osinfoarr[2];
}elseif(strstr($osversioninfo,'BB10')){//黑莓
$osinfoarr = explode(';',$osversioninfo);
$os = 'bb';
$device = $osinfoarr[0];
$deviceinfo = $osinfoarr[1];
}elseif(strstr($osversioninfo,'MeeGo')){//诺基亚
$osinfoarr = explode(';',$osversioninfo);
$os = 'NOKIA';
$device = $osinfoarr[0];
$deviceinfo = $osinfoarr[1];
}elseif(strstr($osversioninfo,'Windows') && strstr($osversioninfo,'Microsoft')){//微软
$osinfoarr = explode(';',$osversioninfo);
$os = 'WinPhone';
$device = $osinfoarr[0];
$deviceinfo = $osinfoarr[count($osinfoarr) - 1];
}