filter.php

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

$input_filter = elgg_extract('active_filter', $vars);

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

    $key = preg_replace('/[^a-z0-9-]/i', '-', elgg_strtolower($key));
    
    $options = [];
    if ($key === $input_filter) {
        $options['class'] = 'elgg-state-selected';
    }
    
    $list_items .= elgg_format_element('li', $options, elgg_view_url('#', $category, ['rel' => $key]));
}

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

echo elgg_view_module('', elgg_echo('filter'), $body, [
    'id' => 'plugins-filter',
]);