WordPress add a new page to admin section

2 comments

1. When you add a page with add_submenu_page(), the url should be something like:

   wp-admin/admin.php?page=<your_page_handle>

   Your page is actually loaded from admin.php (typically). You can add parameters to your links by appending something like &id=3 and then have your main plugin page-loading logic determine which file to include based on the parameter.

   For instance

   if (isset($_GET['id']) && ((int) $_GET['id']) == 3) {
     include 'second_page.php';
   } else {
     include 'first_page.php';
   }
   

   Edit:

   I found a trick that may be easier for you, though I haven’t thoroughly tested it. Let’s say that you have two pages: my_one and my_two. Just call add_submenu_page twice, and set the second page’s parent as the first page. This will cause WordPress to not add a link to the navigation bar, but you can still access your page by navigating to admin.php?page=my_two.

   Example:

       add_submenu_page( 
             'my_toplevel_link'   
           , 'Page Title'
           , 'Link Name'
           , 'administrator'
           , 'my_one' // here's the page handle for page one
           , 'my_one_callback'
       );
       add_submenu_page( 
             'my_one'  // set the parent to your first page and it wont appear
           , 'Page Title'
           , 'Link Name'  // unused
           , 'administrator'
           , 'my_two'
           , 'my_two_callback'
       );
   

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2. Since WP natively supports URLs like wp-admin/admin.php?page=<your_page_handle> you can do sub pages with something like:

   wp-admin/admin.php?page=yourpage

   wp-admin/admin.php?page=yourpage&sub=2

   wp-admin/admin.php?page=yourpage&sub=3

   Then in the code that handles wp-admin/admin.php?page=<your_page_handle> you just look at the $_GET and pull up the main page or a sub-page as needed.

   I’ve definitely seen plugins where the admin page has a little row of links across the top linking the various sub-pages.

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