maintenance.php

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<?php
// render content before head so that JavaScript and CSS can be loaded. See #4032
$messages = elgg_view('page/elements/messages', ['object' => elgg_extract('sysmessages', $vars)]);
$content = elgg_extract('body', $vars);

$title = elgg_extract('title', $vars, elgg_get_site_entity()->getDisplayName());
$favicon = elgg_view('page/elements/shortcut_icon', $vars);
$css = elgg_get_simplecache_url('maintenance.css');
$head = <<<__HEAD
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>$title</title>
    $favicon
    <link href="$css" rel="stylesheet">
__HEAD;

$body = <<<__BODY
<div class="elgg-page elgg-page-maintenance" id="elgg-maintenance-page-wrapper">
    <div class="elgg-page-messages">
        $messages
    </div>
    <div class="elgg-body-maintenance">
        $content
    </div>
</div>
__BODY;

echo elgg_view("page/elements/html", ['head' => $head, 'body' => $body]);