/**
 * Get working days between two dates, with custom off day
 *
 * @param Date $startDate End Date
 * @param Date $endDate To date
 * @param Array $holidays Week Number in Single dimension array
 * @return integer
 */

function getWorkingDays_customOffDay($startDate, $endDate, $holidays) {

    $day = 86400; // Day in seconds

    $sTime = strtotime($startDate); // Start as time
    $eTime = strtotime($endDate); // End as time
    $numDays = round(($eTime - $sTime) / $day) + 1;

    $days = array();

    for ($d = 0; $d < $numDays; $d++) {
        $day_number = date('N', ($sTime + ($d * $day)));
        if (!in_array($day_number, $holidays)) {
            $days[] = date('Y-m-d N', ($sTime + ($d * $day)));
        }
    }

    return count($days);

}

/**
 * Get working days between two dates, with custom off day
 *
 * @param Date $startDate End Date
 * @param Date $endDate To date
 * @param integer $holidays Week Number in Single dimension array
 * @return integer
 */

function getWorkingDays_customOffDay($startDate, $endDate, $holidays) {

    $day = 86400; // Day in seconds
    $format = ''; // Output format (see PHP date funciton)


    $sTime = strtotime($startDate); // Start as time
    $eTime = strtotime($endDate); // End as time
    $numDays = round(($eTime - $sTime) / $day) + 1;

    $days = array();


    for ($d = 0; $d < $numDays; $d++) {
        $day_number = date('N', ($sTime + ($d * $day)));
        if (!in_array($day_number, $holidays)) {
            $days[] = date('Y-m-d N', ($sTime + ($d * $day)));
        }
    }

    return count($days);

}

/**
     * Get working days between two dates, with custom off day 
     * 
     * @param Date $startDate End Date 
     * @param Date $endDate To date
     * @param integer $holidays Week Number in Single dimension array
     * @return integer 
     */

    function getWorkingDays_customOffDay($startDate, $endDate, $holidays) {

        $day = 86400; // Day in seconds
        $format = ''; // Output format (see PHP date funciton)


        $sTime = strtotime($startDate); // Start as time
        $eTime = strtotime($endDate); // End as time
        $numDays = round(($eTime - $sTime) / $day) + 1;

        $days = array();


        for ($d = 0; $d < $numDays; $d++) {
            $day_number = date('N', ($sTime + ($d * $day)));
            if (!in_array($day_number, $holidays)) {
                $days[] = date('Y-m-d N', ($sTime + ($d * $day)));
            }
        }

        return count($days);
        
    }

Get working days between two dates, with custom off day

date

PHP