PHP Fungsi Ambil Rentang tanggal

function getDates($sDate, $eDate=NULL){
    $eDate = $eDate ? $eDate : date('Y-m-d');
    $day = 86400;
    if(strtotime($sDate)>strtotime($eDate)){
        $startDate = strtotime($eDate);
        $endDate = strtotime($sDate);
    }else{
        $startDate = strtotime($sDate);
        $endDate = strtotime($eDate);
    }
    $numDays = round(($endDate - $startDate) / $day) + 1;
    $days = array();
    for ($i = 0; $i < $numDays; $i++) {
        $tgl = date($format, ($startDate + ($i * $day)));
        $hari = date('w', ($startDate + ($i * $day)));
        $days[] = $tgl;
    }
    return array_values(array_filter($days));
}