Control what a client can see in WordPre

gistfile1.txt

// Create the client_admin role
function create_client_admin_role() {
    add_role(
        'client_admin',
        'Client Admin',
        get_role('administrator')->capabilities
    );
}
add_action('init', 'create_client_admin_role');

// Modify admin menu for client_admin
function modify_admin_menu_for_client_admin() {
    if (current_user_can('client_admin')) {
        global $menu, $submenu;

        // Get all post types
        $args = array(
           'public'   => true,
           '_builtin' => false
        );
        $custom_post_types = get_post_types($args, 'names', 'and');

        // Define menu items to keep
        $keep_menu_items = array(
            'edit.php', // Posts
            'edit.php?post_type=page', // Pages
            'upload.php', // Media
            'nav-menus.php', // Menus
            'themes.php' // Required for accessing Menus
        );

        // Add custom post types to the keep list
        foreach ($custom_post_types as $post_type) {
            $keep_menu_items[] = "edit.php?post_type={$post_type}";
        }

        // Remove menu items
        foreach ($menu as $key => $item) {
            if (!in_array($item[2], $keep_menu_items)) {
                remove_menu_page($item[2]);
            }
        }

        // Remove specific submenu items that we don't want to keep
        $remove_submenu_items = array(
            'upload.php' => array('media-new.php'), // Remove "Add New" under Media
            'themes.php' => array('themes.php', 'theme-editor.php', 'customize.php') // Remove theme-related items
        );

        foreach ($remove_submenu_items as $parent => $items) {
            foreach ($items as $item) {
                remove_submenu_page($parent, $item);
            }
        }

        // Ensure Menus is accessible under Appearance
        if (isset($submenu['themes.php'])) {
            foreach ($submenu['themes.php'] as $key => $item) {
                if ($item[2] === 'nav-menus.php') {
                    continue; // Keep Menus
                }
                remove_submenu_page('themes.php', $item[2]);
            }
        }
    }
}
add_action('admin_menu', 'modify_admin_menu_for_client_admin', 999);