Count number of day occurrences in a given period with Nesbot Carbon and PHP/Laravel

date_stuff.php

    /**
     * @param $timePeriod
     * @param $day
     *
     * @return int
     */
    private function getNumberOfSpecificDaysInPeriod($timePeriod, $day)
    {
        $numberOfDaysInPeriod = $this->geDaysInPeriod($timePeriod) - 1;

        $dynamicDayVariable = 'is'. $day;

        $startOfPeriod = Carbon::now()->subDays($numberOfDaysInPeriod);

        return $startOfPeriod->diffInDaysFiltered(function ($date) use ($dynamicDayVariable) {
            return $date->$dynamicDayVariable();
        }, Carbon::now());
    }

    /**
     * @param $timePeriod
     *
     * @return int
     */
    private function getDaysInPeriod($timePeriod)
    {
        switch ($timePeriod) {
            case 'week':
                $days = 7;
                break;
            case 'month':
                $days = 30;
                break;
            case 'quarter':
                $days = 92;
                break;
            case 'year':
                $days = 365;
                break;
            default:
                $days = 1;
        }

        return $days;
    }

Inspired by: https://gist.github.com/depsimon/22260e7106dfa961c6a37e12d0386082

https://carbon.nesbot.com/docs/