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

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

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

        foreach (array_keys($argv) as $key) {
            if (is_numeric($argv[$key])) {
                $rangeList[] = $argv[$key];
            } elseif (is_array($argv[$key])) {
                $rangeList = array_merge($rangeList, $argv[$key]);
            }
        }

        foreach ($rangeList as $range) {
            if ($range > $maxRange) {
                $maxRange = $range;
            }
        }
    }

    return floatval($maxRange);

}

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