요일을 받아와서 실행시키는 조건문좀 봐주세요 채택완료

$dayOfWeek = $startDate->format('N');
      if ($dayOfWeek < 6) {
      실행
      }

<input type="checkbox" name="yoil[]"  value="0" >모든요일&nbsp;&nbsp;&nbsp;&nbsp;
<input type="checkbox" name="yoil[]"  value="1"   >월&nbsp;&nbsp;
<input type="checkbox" name="yoil[]"  value="2"   >화&nbsp;&nbsp;
<input type="checkbox" name="yoil[]"  value="3"   >수&nbsp;&nbsp;
<input type="checkbox" name="yoil[]"  value="4"   >목&nbsp;&nbsp;
<input type="checkbox" name="yoil[]"  value="5"   >금&nbsp;&nbsp;

$selected_days = array_filter($_POST['yoil'], function($day) {
            return is_numeric($day);
        });

        $selected_days_string = implode(',', $selected_days);