How to display a thumbnail of a post with a background image

To display a thumbnail of a post as a background image, it is sufficient to use the following code:

<?php
$thumbnail_id = get_post_thumbnail_id($post->ID);
$thumbnail_object = get_post($thumbnail_id); 
echo ($thumbnail_object->guid); ?>

<?php

$thumbnail_id = get_post_thumbnail_id($post->ID);

$thumbnail_object = get_post($thumbnail_id);

echo ($thumbnail_object->guid); ?>

This code gets the URL of the attached image. On an example it looks like this:

<div class="background" style="background: url(' <?php
$thumbnail_id = get_post_thumbnail_id($post->ID);
$thumbnail_object = get_post($thumbnail_id); 
echo ($thumbnail_object->guid); ?> ')">

<div class="background" style="background: url(' <?php

$thumbnail_id = get_post_thumbnail_id($post->ID);

$thumbnail_object = get_post($thumbnail_id);

echo ($thumbnail_object->guid); ?> ')">

The code is basically suitable for entries, pages, products and product categories.

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