Question 201050 in Wordpress Question posted in
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WordPress – how to restrict a menu for some userd based on the value of a specific field?

On my primary wp nav, I have a menu item named ‘Research’ which i want to only be shown for Researchers in wordpress.

Researchers will be defined by a user meta field called wpum_relationship_to_lib which is a multiple choices field including options like: researcher, student, employee and so on.

It is important that researcher must be one of the options the user choses to access that menu and that wpum_relationship_to_lib does not define a WordPress role.

All menus are primary. Also, I need the menu to be hidden even before login. See my code below which is not restricting menu properly.

function restrict_menu_to_researchers($items, $args) {
  
  // Check if the menu is assigned to the desired location
  if ($args->theme_location === 'primary') {

    // Check if the user is logged in
    if (is_user_logged_in()) {

      $user_id = get_current_user_id();
      $relationship_values = get_user_meta($user_id, 'wpum_relationship_to_lib', true);
            
      // Check if the user is the "researcher" 
      if (is_array($relationship_values) && in_array('researcher', $relationship_values)) {

        // Allow the menu for researchers
        return $items; 

      } else {
        foreach ($items as $key => $item) {
          if ($item->title == 'Research') {
            // Hide the "Research" menu for non-researchers
            unset($items[$key]); 
          }
        } 
      }
    } else {
      foreach ($items as $key => $item) {
        if ($item->title == 'Research') {
          // Hide the "Research" menu for non-logged-in users
          unset($items[$key]);
        }
      }
    }
  }
  return $items;
}
add_filter('wp_nav_menu_objects', 'restrict_menu_to_researchers', 10, 2);
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2

Answers


  1. 0

    Actually ignore my comment, using $item->title seems to work as well.

    I think your looping is wrong in yours. Try this version.

    https://developer.wordpress.org/reference/hooks/wp_nav_menu_objects/

    See comments in php so you understand what is going on.

    function restrict_menu_to_researchers( $menu_objects, $args )
{

    // bail early if not on primary menu
    if ('primary' !== $args->theme_location) {
        return $menu_objects;
    }

    // if user is logged in
    if (is_user_logged_in()) {

        // get relationship array
        $relationship_array = (array)get_user_meta(get_current_user_id(), 'wpum_relationship_to_lib', true);
        
        // foreach menu as key > menu object
        foreach ($menu_objects as $key => $menu_object) {

            // if menu object title is Research and is not in relationship array
            if ( $menu_object->title === 'Research' && !in_array($menu_object->title, $relationship_array ) ) {

                // then restrict the menu object item
                unset( $menu_objects[$key] );
                
            }

        }

    }

    // return menu objects
    return $menu_objects;

}

add_filter('wp_nav_menu_objects', 'restrict_menu_to_researchers', 10, 2 );
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  2. 0

    The code provided is mostly correct. However, there is a small issue in the conditional statement when checking the user’s relationship values. I updated the code to ensure that the "Research" menu item is only shown to users who have selected "researcher" as one of their relationship values in the wpum_relationship_to_lib meta field. It also hides the "Research" menu for non-logged-in users. I did not tested the code, so any comment is welcome.
    The code of #joshmoto is working, but in the foreach loop, the condition !in_array($menu_object->title, $relationship_array) checks if the menu object title is not in the relationship array. From what i understood from the question, you want to check if the value "researcher" is in the relationship array. Therefore, you should update the condition to in_array(‘researcher’, $relationship_array).

    function restrict_menu_to_researchers($items, $args) {
  // Check if the menu is assigned to the desired location
  if ($args->theme_location === 'primary') {
    // Check if the user is logged in
    if (is_user_logged_in()) {
      $user_id = get_current_user_id();
      $relationship_values = get_user_meta($user_id, 'wpum_relationship_to_lib', true);
      
      // Check if the user has selected "researcher" as one of their relationship values
      if (is_array($relationship_values) && in_array('researcher', $relationship_values, true)) {
        // Allow the menu for researchers
        return $items;
      } else {
        // Hide the "Research" menu for non-researchers
        foreach ($items as $key => $item) {
          if ($item->title === 'Research') {
            unset($items[$key]);
          }
        }
      }
    } else {
      // Hide the "Research" menu for non-logged-in users
      foreach ($items as $key => $item) {
        if ($item->title === 'Research') {
          unset($items[$key]);
        }
      }
    }
  }
  return $items;
}
add_filter('wp_nav_menu_objects', 'restrict_menu_to_researchers', 10, 2);
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