filter.php

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<?php
$categories = elgg_extract('category_options', $vars);
if (empty($categories)) {
    return;
}

$list_items = '';
foreach ($categories as $key => $category) {
    if (empty($key)) {
        continue;
    }

    $key = preg_replace('/[^a-z0-9-]/i', '-', $key);
    $link = elgg_view('output/url', array(
        'text' => $category,
        'href' => '#',
        'rel' => $key
    ));

    $list_items .= elgg_format_element('li', array(), $link);
}

$body = elgg_format_element([
    '#tag_name' => 'ul',
    'class' => 'elgg-admin-plugins-categories elgg-admin-sidebar-menu elgg-menu-hz',
    '#text' => $list_items,
]);

echo elgg_view_module('', elgg_echo('filter'), $body);