PHP - How To Write This Mysql_real_escape_string Into Dropdownlist?

<?php
require_once($_SERVER['DOCUMENT_ROOT'].'/dbconnect.php');
?>
 
<script type="text/javascript" src="http://ajax.googleapis.com/
ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">

$(document).ready(function()
{
$(".country").change(function()
{
var id=$(this).val();
var dataString = 'id='+id;

$.ajax
({
type: "POST",
url: "edit_form.php",
data: dataString,
cache: false,
success: function(html)
{
$(".city").html(html);
}
});

});
});
</script>

<?php

$id_test=$_POST['selector'];
$N = count($id_test);
for($i=0; $i < $N; $i++)
{
    $result = mysqli_query($conn, "SELECT * FROM cloud where id='$id_test[$i]'");
    while($row = mysqli_fetch_array($result))
      {
          
          $id_bird = $row['id'];

?>

<div style="margin:80px">
<label>Country :</label> <select name="country" class="country">
<option selected="selected">--Select Country--</option>
<?php
$sql=mysqli_query($conn, "SELECT category.id AS cat_id, category.name, category.type, cloud.id
FROM cloud,category,link_category_cloud
WHERE link_category_cloud.cloud_id = cloud.id
AND link_category_cloud.category_id = category.id
AND cloud.id='$id_test[$i]'");
while($row=mysqli_fetch_array($sql))
{
$id_test=$row['cat_id'];
$data=$row['name'];
echo '<option value="'.$id_test.'">'.$data.'</option>';
 } ?>
</select>
<br/>
<br/>
<label>City :</label> <select name="city" class="city">
<option selected="selected">--Select City--</option>

</select>

</div>

<?php
      }
}

?>

<?php
require_once($_SERVER['DOCUMENT_ROOT'].'/dbconnect.php');
$cat_id = $_GET['cat_id'];
$cloud_id = $_GET['id'];
if($_POST['id_test'])
{
$id_test=$_POST['id_test'];
$data=$_POST['data'];
$sql=mysqli_query($conn, "SELECT * FROM link_category_cloud WHERE category_id={$cat_id}");

$data=$row['cloud_id'];
$id_test=$_POST['id_test'];
echo '<option value="'.$id_test.'">'.$id_test.' '.$data.'</option>';

//}
}

?>