PHP mysqli empty array - php

Question

I have a question about my code. When i try to fill my html with my fetched array i only get blank spaces instead of the actual results. Can anyone tell me why ?
<?php
require_once("php/loader.inc.php");
include("php/header.php");
include("php/userpanel.php");
$gebruiker = $_SESSION['user'];
?>
<div class="large-8 columns">
<div class="row">
<?php
$query = "
SELECT
items.naam,
items.prijs,
items.image_url
FROM inventory
JOIN items
ON items.id = inventory.item_id
WHERE
gebruiker_id = ?
";
$stmt = $db->prepare($query);
$stmt-> bind_param('i', $gebruiker->id);
$stmt->execute();
$result = $stmt->get_result();
while ($row = $result->fetch_assoc())
{
$user_items[] = $row;
echo '<div class="large-3 small-4 columns">
<img src="'. $user_items['image_url'] .'">
<div class="panel">
<h6>'. $user_items['naam'] .'</h6>
<h6 class="subheader">'. $user_items['prijs'] .'</h6>
</div>
</div>';
}
?>
By the way, when i try print_r($user_items); it gives me the expected result.
Thanks in advance!

Answer 1

I think you want to change this:
$user_items[] = $row;
to this:
$user_items = $row;
Otherwise your indexes are 1 dimension 'deeper'
As an example:
$row = array("image_url" => "xy");
after this line:
$user_items[] = $row;
You can't access it with:
echo $user_items["image_url"]; //Wrong
you would have to do this:
echo $user_items[0]["image_url"]; //works

Answer 2

You don't need this line $user_items[] = $row; you can use $row directly
while ($row = $result->fetch_assoc())
{
echo '<div class="large-3 small-4 columns">
<img src="'. $row['image_url'] .'">
<div class="panel">
<h6>'. $row['naam'] .'</h6>
<h6 class="subheader">'. $row['prijs'] .'</h6>
</div>
</div>';
}