layout.php

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<?php
$item = elgg_extract('item', $vars);
if (!$item instanceof ElggRiverItem) {
    return;
}

$name = $item->getSubjectEntity()->getDisplayName();
$name = htmlspecialchars($name, ENT_NOQUOTES, 'UTF-8');
$title = elgg_echo('river:update', [$name]);

$timestamp = date('r', $item->getTimePosted());

$summary = elgg_view('river/elements/summary', $vars, 'default');
$summary = elgg_strip_tags($summary);

$body = elgg_extract('summary', $vars, $summary);

$object = $item->getObjectEntity();
if ($object) {
    $url = htmlspecialchars($object->getURL());
} else {
    $url = elgg_normalize_url('activity');
}

$site_url = parse_url(elgg_get_site_url());
$domain = htmlspecialchars($site_url['host'], ENT_NOQUOTES, 'UTF-8');
$path = '';
if ($site_url['path']) {
    $path = htmlspecialchars($site_url['path'], ENT_NOQUOTES, 'UTF-8');
    $path = "::$path";
}

$html = <<<__HTML
    <guid isPermaLink="false">$domain$path::river::$item->id</guid>
    <pubDate>$timestamp</pubDate>
    <link>$url</link>
    <title><![CDATA[$title]]></title>
    <description><![CDATA[$body]]></description>
__HTML;

echo $html;