Add Working Day with Holidays

addWorkDay.php

<?php
 
/**
* Add Working Day with Holidays
*
* @param \DateTimeInterface $first
* @param int|null $weekDay
* @param \DateTimeInterface[]|null $holidays
*
* @return \DateTimeInterface
*/
public function addWorkingDay(\DateTimeInterface $first, ?int $weekDay, ?array $holidays): \DateTimeInterface
{
    // Add Week Day
    $last = $weekDay ? (clone $first)->modify("+{$weekDay} weekday") : $first;

    // Append Holiday
    $append = 0;
    foreach ($holidays as $index => $holiday) {
        // Disable Week Day
        $w = (int)$holiday->format('w');
        if ($w === 0 || $w === 6) {
            continue;
        }

        if (($holiday >= $first) && ($holiday <= $last)) {
            unset($holidays[$index]);
            $append++;
        }
    }

    if ($append) {
        return addWeekDay($last, $append, $holidays);
    }

    return $last;
}

Example

$current = new DateTime();
$holidays = [
    new DateTime('2020-07-29'),
    new DateTime('2020-07-30'),
    new DateTime('2020-07-31'),
    new DateTime('2020-08-01'),
    new DateTime('2020-08-02'),
    new DateTime('2020-08-03'),
];

addWeekDay($current, 5, $holidays)