PHP Form Selected getting all values

<?php
if(isset($_POST['feature'])){
  if(isset($_POST['test'])){
    foreach($_POST['test'] as $selected){
    $option = 'No';
    var_dump($row['product_id']);
    }
    }
  }

 ?>



<form action="" method="POST">
<?php
$query = $products->findAll();
 foreach($query as $row){
   if($row['featured'] == 'Yes'){
     echo "<label for='featured'>" . $row['p_name'] . " </label> <input type='checkbox' name='test[]' value ='Yes'checked>
     <input type='hidden' name='product_id' value='" . $row['product_id'] . "'>";
   }
   else
   {
   echo "<label for='featured'>" . $row['p_name'] . " </label> <input type='checkbox' name='test[]' value ='No'>
   <input type='hidden' name='product_id' value='" . $row['product_id'] . "'>";
}
}
 ?>
 <input type="submit" name="feature" value="Feature">

 </form>

Can anyone help me understand when I var_dump the product id's I get an array of the last id and not all of them individually? It's cycling through all that is selected so should return the id value for each of them?