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Ili isto to u razumljivijem formatu...
function parseUserAgent() {
$userAgent = array();
$agent = $_SERVER['HTTP_USER_AGENT'];
$products = array();
$pattern = "([^/[:space:]]*)" . "(/([^[:space:]]*))?"
."([[:space:]]*\[[a-zA-Z][a-zA-Z]\])?" . "[[:space:]]*"
."(\\((([^()]|(\\([^()]*\\)))*)\\))?" . "[[:space:]]*";
while( strlen($agent) > 0 )
{
if ($l = ereg($pattern, $agent, $a))
{
// product, version, comment
array_push($products, array($a[1], // Product
$a[3], // Version
$a[6])); // Comment
$agent = substr($agent, $l);
}
else
{
$agent = "";
}
}
// Directly catch these
foreach($products as $product)
{
switch($product[0])
{
case 'Firefox':
case 'Netscape':
case 'Safari':
case 'Camino':
case 'Mosaic':
case 'Galeon':
case 'Opera':
$userAgent[0] = $product[0];
$userAgent[1] = $product[1];
break;
}
}
if (count($userAgent) == 0)
{
// Mozilla compatible (MSIE, konqueror, etc)
if ($products[0][0] == 'Mozilla' &&
!strncmp($products[0][2], 'compatible;', 11))
{
$userAgent = array();
if ($cl = ereg("compatible; ([^ ]*)[ /]([^;]*).*",
$products[0][2], $ca))
{
$userAgent[0] = $ca[1];
$userAgent[1] = $ca[2];
}
else
{
$userAgent[0] = $products[0][0];
$userAgent[1] = $products[0][1];
}
}
else
{
$userAgent = array();
$userAgent[0] = $products[0][0];
$userAgent[1] = $products[0][1];
}
}
$userAgent[0] = str_replace("MSIE","Internet Explorer",$userAgent[0]);
return $userAgent;
}
i onda proveravas ovako nekako:
$details = parseUserAgent();
switch ($details[0]) {
default: case "Internet Explorer":
//akcija ako je browser IE
break;
case "Opera":
//akcija ako je browser Opera
break;
case "Firefox":
//akcija ako je browser Firefox
break;
case "Safari":
//akcija ako je browser Safari
break;
}
?>
Tj, u $details[0] se nalazi ime browsera, a u $details[1] njegova verzija 
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