placeholder.php

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<?php

$user = elgg_extract('entity', $vars);
if (!$user instanceof ElggUser) {
    return;
}

$guid = (int) $user->guid;
$page_owner_guid = (int) elgg_get_page_owner_guid();
$contexts = elgg_get_context_stack();
$input = (array) elgg_get_config('input');

// generate MAC so we don't have to trust the client's choice of contexts
$data = serialize([$guid, $page_owner_guid, $contexts, $input]);
$mac = elgg_build_hmac($data)->getToken();

echo elgg_format_element('ul', [
    'rel' => $mac,
    'class' => 'elgg-menu elgg-menu-hover',
    'data-menu-placeholder' => '1', // flag for the JS to know this menu isn't fully loaded yet
    'data-elgg-menu-data' => json_encode([
        'g' => $guid,
        'pog' => $page_owner_guid,
        'c' => $contexts,
        'm' => $mac,
        'i' => $input,
    ]),
]);