Why does the code work 2 times?

Question

PHP

On the opencart 2 installation, a directory was created in the root of the site. For example, test which contains the index.php file with the following content.

<?php
include_once('../index.php');
?>

The default index.php from cms is included. When opening domain.ru/test/ the code works 2 times. In the logs, all entries are duplicated. 2 times all requests in bd are executed.
When opening domain.ru/ directly, the code works only 1 time.
How does this happen?

Answer 1

Reason found. Here is a tag
Causes the browser to load the current page as an image.