Calculate date X working days from now

working_days.php

<?php
// accepts a DateTime object which is now by default
// and returns a DateTime object x working days from now
// where x defaults to 1

function get_next_working_day($date = new DateTime, $no_of_days = 1) {

    // add the number of days passed but skip weekends
    for ($i = 0; $i < $no_of_days; $i++) {
        do {
            $date::add(new DateInterval('P1D'));
        }
        while (in_array($date->format('D'), array('Sat', 'Sun'))); // keep adding if day is a Saturday or Sunday
    }
    
    return $date;

}