<?php
ini_set('display_errors', 1); 
ini_set('display_startup_errors', 1); 
error_reporting(E_ALL);
include_once('../../includes/db_connect.php');
$cmpame="";
if(isset($_POST['courseid'])){
    $courseid=$_POST['courseid'];
$listcampus=mysqli_query($con,"SELECT * FROM units WHERE courseid='$courseid' ORDER BY unittitle ASC");
while($lc=mysqli_fetch_assoc($listcampus)){
    $cmpid=$lc['id'];
    $cmpname1=$lc['unittitle'];
    $cmpame.="<option value='$cmpid'>.$cmpname1.</option>";
}
echo $cmpame;
}
?>