filter.php

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<?php
$filter_tabs = (array) elgg_extract('filter', $vars, []);
foreach ($filter_tabs as $name => $tab) {
    if (!is_array($tab)) {
        continue;
    }
    
    if (!isset($tab['name'])) {
        $tab['name'] = $name;
    }
    
    $filter_tabs[$name] = ElggMenuItem::factory($tab);
}

$filter_id = elgg_extract('filter_id', $vars, 'filter');

$menu_params = $vars;
$menu_params['filter_id'] = $filter_id;
$menu_params['items'] = $filter_tabs;
$menu_params['sort_by'] = 'priority';
$menu_params['class'] = 'elgg-menu-filter';
$menu_params['selected_item_name'] = elgg_extract('selected_item_name', $vars, elgg_extract('filter_value', $vars)); // for BC

echo elgg_view_menu("filter:{$filter_id}", $menu_params);