Calculate working days without saturday, sunday and holidays

calc_working_days.php

// based on https://gist.github.com/themattharris/1143040

function calc_working_days($from, $to, $normalise = true)
{
    $_from = is_int($from) ? $from : strtotime($from);
    $_to = is_int($to) ? $to : strtotime($to);
    // normalising means partial days are counted as a complete day.
    if ($normalise) {
        $_from = strtotime(date('Y-m-d', $_from));
        $_to = strtotime(date('Y-m-d', $_to));
    }
    $all_days = @range($_from, $_to, 60 * 60 * 24);
    if (empty($all_days)) return 0;
    $week_days = array_filter(
        $all_days,
        create_function('$t', 'return check_days($t);')
    );
    return count($week_days);
}

function check_days($t)
{

    $holidays_db = Holiday::all()->toArray(); // holidays from db have just month and date

    // get official holidays from db and build array to compare with $check
    $dates = [];
    array_map(function ($holiday) use (&$dates) {
        array_push($dates, $holiday['month'] . '-' . $holiday['day']);
    }, $holidays_db);

    //day of week from requests - 0(sunday)-6(saturday)
    $w = date("w", strtotime(" + {$t} seconds", 0));

    // get day and month from timestamp of requests
    $m = intval(date("m", strtotime(" + {$t} seconds", 0)));
    $d = intval(date("d", strtotime(" + {$t} seconds", 0)));

    $check = $m . '-' . $d;

    return (!in_array($w, array(0, 6)) && !in_array($check, $dates));
}