workday.php

<?php
public function workDay()
    {
        $aDates = [];

        $aDateRanges = \Carbon\CarbonPeriod::create('2020-01-01', '2020-01-23');

        foreach ($aDateRanges->toArray() as $date) {
            $aDates[] = $date->format('Y-m-d');
        }

        $total = collect($aDates)->filter(function($date) {
            return ! in_array(\Carbon\Carbon::parse($date)->format('l'), ['Saturday','Sunday']);
        })->groupBy(function($date) {
            return \Carbon\Carbon::parse($date)->format('W');
        })->map(function($date) {
            return count($date);
        })->reduce(function($carry, $item) {
            return $carry + ($item * 8);
        });

        dd($total);
    }