Not Working

<?php
$dateOne=$_GET['dateOne'];
$dateTwo=$_GET['dateTwo'];
$holidays=$_GET['holidays'];
$holidayarr=preg_split('/[\s]+/', $holidays);
$string='';
$flag=false;
while (strtotime($dateOne) <= strtotime($dateTwo)) {
    if(date('w', strtotime($dateOne)) != 0 &&date('w', strtotime($dateOne))!=6 && !in_array("$dateOne",$holidayarr) ) {
        $string.="<li>".date('d',strtotime($dateOne)).'-'.date('m',strtotime($dateOne)).'-'.date('Y',strtotime($dateOne))."</li>";
        $flag=true;
    }
    $dateOne = date ("d-m-Y", strtotime("+1 day", strtotime($dateOne)));
}
if($flag==true){
    echo "<ol>$string</ol>";
}
else {
    echo "No workdays";

}

?>