footer.php

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<?php
$footer = (string) elgg_extract('footer', $vars);

// add automatic sticky form support
$form_vars = (array) elgg_extract('form_vars', $vars);
if ((bool) elgg_extract('sticky_enabled', $form_vars, false)) {
    $footer .= elgg_view_field([
        '#type' => 'hidden',
        'name' => '_elgg_sticky_form_name',
        'value' => (string) elgg_extract('sticky_form_name', $form_vars),
    ]);
    
    $ignored_fields = (array) elgg_extract('sticky_ignored_fields', $form_vars);
    if (!empty($ignored_fields)) {
        $footer .= elgg_view_field([
            '#type' => 'hidden',
            'name' => '_elgg_sticky_ignored_fields',
            'value' => implode(',', $ignored_fields),
        ]);
    }
}

if (empty($footer)) {
    return;
}

echo elgg_format_element('div', ['class' => 'elgg-form-footer'], $footer);