set_maintenance_mode.php

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<?php
$site = elgg_get_site_entity();

echo elgg_view('output/longtext', [
    'value' => elgg_echo('admin:maintenance_mode:instructions'),
]);

echo elgg_view_field([
    '#type' => 'checkbox',
    '#label' => elgg_echo('admin:maintenance_mode:mode_label'),
    'name' => 'mode',
    'checked' => (bool) elgg_get_config('elgg_maintenance_mode'),
    'switch' => true,
    'value' => 1,
    'default' => 0,
]);

echo elgg_view_field([
    '#type' => 'longtext',
    '#label' => elgg_echo('admin:maintenance_mode:message_label'),
    'name' => 'message',
    'id' => 'message',
    'value' => $site->elgg_maintenance_message ?: elgg_echo('admin:maintenance_mode:default_message'),
]);

$footer = elgg_view_field([
    '#type' => 'submit',
    'text' => elgg_echo('save'),
]);

elgg_set_form_footer($footer);