// float maxRange(mixed, ...) 
function maxRange() {

    $argc = func_num_args();
    $maxRange = 0;

    if (($argc = func_num_arg) == TRUE) {
        $argv = func_get_args();

        foreach (array_keys($argv) as $key) {
            if (is_numeric($argv[$key])) {
                $maxRange = ($argv[$key] > $maxRange) ? $argv[$key] : $maxRange;
            } elseif (is_array($argv[$key])) {
                foreach (array_keys($argv[$key]) as $k) {
                    if (is_numeric($argv[$key][$k])) {
                        $maxRange = ($argv[$key][$k] > $maxRange) ? $argv[$key][$k] : $maxRange;
                    }
                }
            }
        }
    }

    return floatval($maxRange);

}

$largest = maxRange(array(1.23, 543.233, 0.23), 2362.24365, array('10000.20'), 12300.23);
// or 
$largest = maxRange($squad1, $squad2);