[addBusinessDays]

addBusinessDays.php

<?php

function addBusinessDays($startDate, $businessDays)
{
    $date = strtotime($startDate . ' + 1 day');
    $i = 0;

    while($i < $businessDays)
    {
        //get number of week day (1-7)
        $day = date('N', $date);
        //get just Y-m-d date
        $dateYmd = date("Y-m-d",$date);

        if($day < 6){
            $i++;
        }

        if ($i == $businessDays) {
            return $dateYmd;
        }

        $date = strtotime($dateYmd . ' +1 day');
    }
}