<?php

/**
 * Return days between two dates
 *
 * @param string $startDate
 * @param string $endDate
 * @param array $holidays
 * @return integer
 */
function getWorkingDays(string $startDate, string $endDate, array $holidays = []): int
{
    $begin = strtotime($startDate);
    $end   = strtotime($endDate);

    if ($begin > $end) {
        return 0;
    } else {
        $weekends = 0;
        $noDays = 0;
        $holidayCount = 0;

        while ($begin <= $end) {
            if (in_array(date("d/m", $begin), $holidays)) {
                $holidayCount++;
            }

            /* 6 and 7 are weekend days */
            if (date("N", $begin) > 5) {
                $weekends++;
            }

            /* +1 day */
            $begin += 86400;
            /*no of days in the given interval*/
            $noDays++;
        }

        return $noDays - $weekends - $holidayCount;
    }
}