urldecode

$a = explode(`&`, $QUERY_STRING);
$i = 0;
while ($i < count($a)) {
    $b = split(`=`, $a[$i]);
    echo `Value for parameter `, htmlspecialchars(urldecode($b[0])),
         ` is `, htmlspecialchars(urldecode($b[1])), "<br />
";
    $i++;
}