When do i need to get permalink structure of a specific post?

Question

As already known that the function the_permalink echos out the URL for current post in the loop, while the function get_permalink returns the permalink for a specific post using $post_id, but get_permalink has the $leavename that allows return the URL structure of a post to finally (for example) get a URL that looks like this http://localhost/%postname%/. So, When do i may need such output?

Please notice the output:

   <?php 
        $x= get_permalink($post_id, true);
        echo $x;
        //output
        //http://localhost/%postname%/
    ?>

If i turned the $leavename to false i will already have the post name in the URL. So again , What makes me turn it to true

Answer 1

It's used in admin context to display URL previews. When you change the slug of a post, the code that enables that mechanism is getting the format of the URL via that function.