Given two dates what is the best way of finding the number of weekdays in PHP?

Question

The title is pretty much self explanatory. Given two dates what is the best way of finding the number of week days using PHP? Week days being Monday to Friday.

For insta

Answer 1

        $datefrom = strtotime($datefrom, 0);
        $dateto = strtotime($dateto, 0);

        $difference = $dateto - $datefrom;

        $days_difference = floor($difference / 86400);
        $weeks_difference = floor($days_difference / 7); // Complete weeks

        $first_day = date("w", $datefrom);
        $days_remainder = floor($days_difference % 7);

        $odd_days = $first_day + $days_remainder; // Do we have a Saturday or Sunday in the remainder?
        if ($odd_days > 7) { // Sunday
            $days_remainder--;
        }
        if ($odd_days > 6) { // Saturday
            $days_remainder--;
        }

        $datediff = ($weeks_difference * 5) + $days_remainder;

From here: http://www.addedbytes.com/php/php-datediff-function/