Interesting Code with replication

// add new browsers in lower case here, separated
// by spaces - order is important: from left to
// right browser family becomes more precise

$browsers = "mozilla msie gecko firefox ";

$browsers.= "konqueror safari netscape navigator ";

$browsers.= "opera mosaic lynx amaya omniweb";

$browsers = split(" ", $browsers);

$nua = strtolower($_SERVER['HTTP_USER_AGENT']);


$l = strlen($nua);
for ($i=0; $i<count($browsers); $i++)
{
$browser = $browsers[$i];
$n = stristr($nua, $browser);
if(strlen($n)>0){
$GLOBALS["ver"] = "";
$GLOBALS["nav"] = $browser;
$j=strpos($nua, $GLOBALS["nav"])+$n+strlen($GLOBALS["nav"])+1;
for (; $j<=$l; $j++)
{
$s = substr ($nua, $j, 1);
if(is_numeric($GLOBALS["ver"].$s) )
$GLOBALS["ver"] .= $s;
else
break;
}

}
}