<?php

 $dbServername = "localhost"; //servername
 $dbUsername = "root"; //database username
 $dbPassword = ""; //database password
  $dbName = "iams"; //database name

 //Create connection
 $conn = mysqli_connect($dbServername, $dbUsername, $dbPassword, $dbName);

  if(isset($_POST["sched_id"]))
  {

 $sched_id = $_POST["sched_id"];

?>
  <!-- Col-12 -->
        <div class="col-md-12">

          <?php

           $sql = "SELECT user.Schedule_ID, user.FullName FROM user

            WHERE $sched_id IN (Schedule_ID) AND user.UserType = 0";
           $results = mysqli_query($conn, $sql);
           $row = mysqli_fetch_assoc($results);

            ?>
           <div class="row">
           <?php
           foreach ($results as $i => $result) :
             $rows = ceil(count($result) / 3);
           ?>
             <?php if($i % $rows === 0 && $i !== 0): ?>
             </div><div class="row">
           <?php endif;?>

           <div class="col-sm-4">
            <?php echo $result['FullName']; ?>
           </div>
           <?php endforeach;?>

        </div>

      </div>

   <?php } ?>