PHP -> Next nearest date defined by array of days in week

please, really need help with this problem.

I have array of offerDays – $offerDays = array(1,6); (mean Monday, and Saturday);

For example, input date is Wednesday 2014/09/03. Next available date for offers is Saturday 2014/09/06

Question: How I can in php determine nearest next day? Something like

$offerDays = array(1,6);
$inputDate = '2014/09/03'; // filled date, not actual date
$offerDate = findDate($inputDate, $offerDays); // returns 2014/09/06

function findDate($inputDate, $offerDays) {
return 'nearest next date to $inputDate defined by $offerDays';
}

Answer

Here you can have a variable array for the offerdays.

$offerDays = array(1,6);
$inputDate = '2014/09/04'; // filled date, not actual date
$offerDate = findDate($inputDate, $offerDays);

function findDate($inputDate, $offerDays) {
   $date = DateTime::createFromFormat('Y/m/d', $inputDate);
   $num = $date->format('w');

   $min = 10; //initialize minimum days
   foreach($offerDays as $o){  //loop through all the offerdays to find the minimum difference
     $dif = $o - $num;
     if($dif>0 && $dif < $min){
        $min = $dif ;
       }
   }
   // if minimum days is not changed then get the first offerday from next week
   if($min == 10){
      $min = 6 - $num + min($offerDays);
   }

   //add the days till next offerday
   $add = new DateInterval('P'.$min.'D');
   $nextOfferDay = $date->add($add)->format('Y/m/d');

  return $nextOfferDay;
}