I am considering using WordPress for a number of users in overlapping groups, e.g. a user may be in group A and group B, or only group A.
Is it possible to use WordPress to limit access to particular Pages. e.g. Only members of group B can view this page, only members of groups A and C can view that page.
Would this permission extend to the menu item linking to the page? (e.g. if user can't view page, they can't see the menu tab/menu item)
That's an interesting question. You could probably Create Custom Roles and use Roles and Capabilities ( codex.wordpress[dot]org/Roles_and_Capabilities ) to your advantage.
You might also be able to add Custom Fields To each User ( wpengineer[dot]com/2173/custom-fields-wordpress-user-profile ) that could help you achieve this goal.
This bit of code below might be helpful as you research. Entering this code in your functions.php file you can restrict a user with a specified capability from accessing the admin area. As you can see below using current_user_can('capability') you can create a function or use an existing function. Then all you need to do is hook into the action that you need.
/********************* Restrict Admin Area to only Admins **********************/ function restrict_admin() { if ( ! current_user_can( 'manage_options' ) ) { wp_redirect( site_url() ); exit; } } add_action( 'admin_init', 'restrict_admin', 1 ); Good luck!
