Sorry,

My problem was with the menu plugin hook. It is called twice.

False alarm :)

I checked with my host. It is a shared plan, which does not support archive.

 It only supports the following DB engines. 

https://stackoverflow.com/questions/1458122/enabling-archive-engine

https://stackoverflow.com/questions/26996618/install-mariadb-archive-engine

Or use the suggested plugin, and delete the system log archives tables manually from your DB.

Don't forget about this.

Made a ticket for this to handle not having ARCHIVE available a bit more friendly https://github.com/Elgg/Elgg/issues/12905

Copy this file from:

vendor\elgg\elgg\views\default\elgg.js.php

To your custom plugin:

\mod\my_plugin\views\default\elgg.js.php

Comment this:

$elggDir->getPath("js/lib/ui.js"),

Add after:

foreach ($files as $file) {
   readfile($file);
   // putting a new line between the files to address https://github.com/elgg/elgg/issues/3081
   echo "\n";
}

Path to your custom ui.js (e.g. \mod\my_plugin\views\default\lib\ui.js):

readfile(dirname(__FILE__). '/lib/ui.js');
echo "\n";

Clean the caches.

Done.

Works great.

Thank you very much dear RVR

Thank you Jerome. Below is my code.

It behaves strangely. Hope you find my mistake.

//======== In start.php ==========
elgg_register_event_handler('init', 'system', 'title_menu_init');

function title_menu_init() {
    elgg_register_plugin_hook_handler('register', 'menu:title', 'title_menu_handler');
}

function title_menu_handler($hook, $type, $items, $params) {

     $unregister = array("groups:edit", "groups:invite", "edit:icon", "edit:cover");

     $owner = elgg_get_page_owner_entity();

      if($owner->type == 'group') {

            foreach ($items as $item) {

                 $item_name = $item->getName();

                 if (in_array($item_name, $unregister)) {

                      elgg_unregister_menu_item('title', $item_name);

                  } 

             }

            return $items;

       }

}

//======== In the view ========

$title_menu = elgg()->menus->getMenu('title', $params);// Trigger the hook

$title_menu = elgg()->menus->getMenu('title', $params);//== need to call twice to get the menu structure after triggering the hook

$sections = $title_menu->getSections();

$diff = count($sections,1) - count($sections,0);

if ($diff > 0) :

?>

<a class="title-button-nav" rel="toggle" data-toggle-selector=".title-menu-panel" href="#">

<?= elgg_view_icon('cog'); ?> 

</a>

<?php endif; ?>

<nav id="ram-title" class="title-menu-panel" role="navigation">

<?php echo elgg_view_menu('title', array('sort_by' => 'priority')); ?>

</nav>

Like i said in my earlier comment, you need to unset the item from $items like this:

foreach ($items as $index => $item) {

                 $item_name = $item->getName();

                 if (in_array($item_name, $unregister)) {

                      unset($items[$index]);

                  } 

             }

Don't call elgg_unregister_menu_item in the hooks they don't have any effect.

All is well that ends well

Now everything works well and makes sense.

Thank you very much Jerome for your help..... and patience :)

In the title menu there isn't necessarily an 'entity' in params, that's the error.

Also 'title' menu which is used by many plugins is not found in the developer tools

That's because in order to show information there we have to fake some menu's but the title menu has to many variables on order to fake correctly.

Lot's of menu items are dependent on page owner, context or something else.

I understand.

Thank you

Thank you iionly

Out of curiosity why do you use reference.elgg.org?

Since I setup Elgg in my IDE (Eclipse) I have autocomplete on all functions and I can click on a function to go to that function and read the documentation.

Before we had Eclipse setup correctly we used the reference extensively, but after the setup we never looked at it again.

This is very useful comment for me.

I'll start to learn and work with Eclipse IDE.

Thank you Jerome.