messages.php

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<?php
$messages = (array) elgg_extract('object', $vars, []);

if (!empty($messages)) {
    elgg_require_js('elgg/system_messages');
}

// hidden li so we validate, we need this for javascript added system messages
$list_items = elgg_format_element('li', ['class' => 'hidden']);

foreach ($messages as $type => $list) {
    foreach ($list as $message) {
        $message_vars = $message->getVars(['title' => false]);
        if ($message->getTtl() > -1) {
            // 0 means persistent
            $message_vars['data-ttl'] = $message->getTtl() * 1000;
        } elseif (isset($message_vars['link'])) {
            // keep the message persistent if there is a link
            $message_vars['data-ttl'] = 0;
        }
        
        $list_items .= elgg_format_element('li', [], elgg_view_message($message->getType(), $message->getMessage(), $message_vars));
    }
}

echo elgg_format_element('ul', ['class' => 'elgg-system-messages'], $list_items);