无法从PHP中的选择下拉列表中检索多个值

The issue is i can only retrieve one value from the select dropdown even i have selected 2, have tried to look at similar question here,but none seems to work for me. Any thoughts? Thanks

if (isset($_POST['submit'])){

$smsorcall = $_POST['smsorcall'];

foreach($smsorcall AS $index => $smsorcall ) {

echo "$smsorcall";}

}

  <form action="newpatient.php" method="post">
  
   <p>Reminder Preference: *</p> 
          <select name="smsorcall[]" style="width: 250px" class="form-control" multiple>
        
          <option value="SMS">SMS</option>
          <option value="Call">Call</option>
          <option value="Email">Email</option>
          
          </select>
          
          
           <button type="submit" name="submit">Submit</button>

          </form>

My code

   <?php ob_start();
   session_start();

  include('connect-db.php');

  if (isset($_POST['submit']))
  {


  $patientid = $_POST['patientid'];

  $smsorcall = $_POST['smsorcall'];

  foreach($smsorcall AS $index => $smsorcall ) {

  echo "$smsorcall";}



 $_SESSION['smsorcall'] = $smsorcall;

In another html page, i echo the $_SESSION['smsorcall'] to display the result

</div>

You are only saving the last value to the session - you should save the whole array from the POST, then when you want to get the values loop through the array from the session, e.g.:

if (isset($_POST['submit']))
{
    // save the WHOLE ARRAY of selected options to the session
    $_SESSION['smsorcall'] = $_POST['smsorcall'];

    /* Any more code here... */
}

On your other page:

if (isset($_SESSION['smsorcall']))
{
    // Get the array of all selected options from the session
    $smsorcall = $_SESSION['smsorcall'];

    // loop through the array to process each option one at a time
    foreach($smsorcall AS $index => $option ) {
        // Do whatever you want with each option here, e.g. to display it:
         echo $option;
    }
}