I install my plugin in several sites and the submenu links generation at backed works fine, but fails in one specific site.

I use the follow code to add the submenu items:

    'Plugin name',
    'Plugin name',

    'Link 1',
    'Link 1',

This will generate a menu box at backed with one link inside and the main link in the title of menu box. When I click on the main link at menu box I get correctly redirected to my page with a URL like follow:


But when I click on the submenu link I'm wrongly redirected to:


Instead of: http://mysite.net/wp-admin/admin.php?page=myplugin.php

I really don't know what I have to check in order to figure this out. The WordPress version used in the site that gives me this problem is Version 3.3.1 and I haven't any other plugin activated.

How I can proceed? Any tip or help will be appreciated.

  • What happens if you use...say 'my_test_string' instead of basename(__FILE__) for your slug?
    – mor7ifer
    Feb 14, 2012 at 14:15
  • 2
    I'm not sure if this can cause the problem, but you don't need basename() function, just use __FILE__.
    – Mamaduka
    Feb 14, 2012 at 14:22
  • m0r7if3r: I did the change and the generated link is broken too (point to a non existing page), is mysite.net/wp-admin/myplugin.php?page=my_test_string
    – leticia
    Feb 18, 2012 at 23:24
  • Mamaduka: Thank. I did the change and the problem disappears. In my local server works in both ways but in that installation only works if I put in the way you suggest. I really don't know why. If you put your reply as an answer I will select you.
    – leticia
    Feb 18, 2012 at 23:32
  • maybe was the fact that I change the menu slug so WordPress reload some information about the menu?
    – leticia
    Feb 18, 2012 at 23:39

1 Answer 1


WordPress is doing exactly what you're telling it to do. Refer to the Codex entry for add_submenu_page(). The functions arguments are like so:


So, you're assigning the same string to $parent_slug and $menu_slug. For obvious reasons, these two need to be different.

  • $parent_slug is the slug of the parent menu page. You assign that as basename( __FILE__ ) in your add_menu_page() call.

  • $menu_slug is the slug of the sub-menu page. Note what the Codex says:

    If you want to NOT duplicate the parent menu item, you need to set the name of the $menu_slug exactly the same as the parent slug.

While this statement is written confusingly, I think it's saying that by setting $parent_slug and $menu_slug the same, you're replacing the main-parent sub-menu entry with this page - and it sounds like that's not what you want to do.

  • Thanks for the answer, but the questions indeed is why the second generated link is different than the first, because I want both be the same. Note that the second has myplugin.php?page=myplugin.php instead of admin.php?page=myplugin.php
    – leticia
    Feb 18, 2012 at 23:20
  • Thanks! I came here when I googled to see what the explanation of $menu_slug was trying to say. Very confusingly written in the codex so glad of the help.
    – Adam
    Jul 16, 2013 at 7:47

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