Add button to wp admin?

Question

PHP

Hi all!
Tell me how to add a link here that leads to the export import page.
Thank you.

Answer 1

$subject = "23456/10000";
echo preg_replace('/^(\d{2})(\d{2})/','\1.\2',$subject);

Answer 2

Try like this

$subject = "23456/10000";
preg_match('/^(\d{2})(\d{2})/',$subject,$matches);
var_dump("{$matches[1]}.{$matches[2]}");

Answer 3

add_menu_page () / add_submenu_page() functions manage_posts_extra_tablenav
hook