save.php

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<?php
// get site menu items
$menu = elgg()->menus->getUnpreparedMenu('site', [
    'sort_by' => 'name',
]);

$menu_items = $menu->getItems();

$num_featured_items = elgg_extract('num_featured_items', $vars, count($menu_items));

$featured_menu_names = elgg_get_config('site_featured_menu_names');

$dropdown_values = [];
/* @var $item \ElggMenuItem */
foreach ($menu_items as $item) {
    $dropdown_values[$item->getName()] = $item->getText();
}
$dropdown_values[' '] = elgg_echo('none');

$configure = elgg_view('output/longtext', [
    'value' => elgg_echo('admin:menu_items:description'),
    'class' => 'elgg-text-help',
]);

$fields = [];
for ($i = 0; $i < $num_featured_items; $i++) {
    if ($featured_menu_names && array_key_exists($i, $featured_menu_names)) {
        $current_value = $featured_menu_names[$i];
    } else {
        $current_value = ' ';
    }

    $fields[] = [
        '#type' => 'select',
        'options_values' => $dropdown_values,
        'name' => 'featured_menu_names[]',
        'value' => $current_value,
    ];
}

$configure .= elgg_view_field([
    '#type' => 'fieldset',
    'class' => 'elgg-fieldset-wrap',
    'align' => 'horizontal',
    'fields' => $fields,
]);

echo elgg_view_module('info', elgg_echo('admin:menu_items:configure'), $configure);

$add_menu = elgg_view('output/longtext', [
    'value' => elgg_echo('admin:add_menu_item:description'),
    'class' => 'elgg-text-help',
]);

$custom_items = (array) elgg_get_config('site_custom_menu_items');
$custom_items[''] = ''; // add empty option

$name_str = elgg_echo('name');
$url_str = elgg_echo('admin:plugins:label:website');

foreach ($custom_items as $title => $url) {
    $add_menu .= elgg_view_field([
        '#type' => 'fieldset',
        'align' => 'horizontal',
        'fields' => [
            [
                '#type' => 'text',
                '#label' => $name_str,
                'name' => 'custom_menu_titles[]',
                'value' => $title,
            ],
            [
                '#type' => 'text',
                '#label' => $url_str,
                'name' => 'custom_menu_urls[]',
                'value' => $url,
            ]
        ],
    ]);
}

echo elgg_view_module('info', elgg_echo('admin:add_menu_item'), $add_menu);

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

elgg_set_form_footer($footer);