How to link to different pages in one template?

Question

PHP

There are pages: " product 1 " and " product 2 ".
Each of these pages lists products ("product 1.1", "product 2.1", etc.).
When we go to the "product 1.1" page, we get the following address: Therefore, when we go to the "product 2.1" page, we get the following address: On each page ("product 1.1/2.2", etc.) there is a link "back to all products" . The page template ("product 1.1" and "product 2.2", etc.) is the same. Question: How to correctly create a "return to all products" link code in wordpress so as not to make two identical templates (files) and not to prescribe the ID of the corresponding category according to the principle
http://example.ru/товар 1/товар 1.1
http://example.ru/товар 2/товар 2.1

<?php
echo '<a href="' . get_permalink(1) . '">вернуться ко всем товарам 1</a>';
?>
<?php
echo '<a href="' . get_permalink(2) . '">вернуться ко всем товарам 2</a>';
?>

Answer 1

get_permalink( wp_get_post_parent_id() )
?