groups.php

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<?php

use Elgg\Exceptions\Http\EntityPermissionsException;

elgg_gatekeeper();

$options = [
    'query' => elgg_extract('term', $vars),
    'type' => 'group',
    'limit' => elgg_extract('limit', $vars),
    'sort_by' => [
        'property_type' => 'metadata',
        'property' => 'name',
        'direction' => 'ASC',
    ],
    'fields' => ['metadata' => ['name']],
    'item_view' => elgg_extract('item_view', $vars, 'search/entity'),
    'input_name' => elgg_extract('name', $vars),
];

$target_guid = (int) elgg_extract('match_target', $vars);
if ($target_guid) {
    $target = get_entity($target_guid);
} else {
    $target = elgg_get_logged_in_user_entity();
}

if (!$target instanceof \ElggEntity || !$target->canEdit()) {
    throw new EntityPermissionsException();
}

if (elgg_extract('match_owner', $vars, false)) {
    $options['owner_guid'] = (int) $target->guid;
}

if (elgg_extract('match_membership', $vars, false)) {
    $options['relationship'] = 'member';
    $options['relationship_guid'] = $target->guid;
}

$body = elgg_list_entities($options, 'elgg_search');

echo elgg_view_page('', $body);