edit.php

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<?php
$widget = elgg_extract('entity', $vars);

// handle upgrade to 1.7.2 from previous versions
if ($widget->icon_size == 1) {
    $widget->icon_size = 'small';
} elseif ($widget->icon_size == 2) {
    $widget->icon_size = 'tiny';
}

// set default value for icon size
if (!isset($widget->icon_size)) {
    $widget->icon_size = 'small';
}

echo elgg_view('object/widget/edit/num_display', [
    'entity' => $widget,
    'default' => 12,
    'label' => elgg_echo('friends:num_display'),
    'options' => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 20, 30, 50, 100],
]);

echo elgg_view_field([
    '#type' => 'select',
    'name' => 'params[icon_size]',
    '#label' => elgg_echo('friends:icon_size'),
    'value' => $widget->icon_size,
    'options_values' => [
        'small' => elgg_echo('friends:small'),
        'tiny' => elgg_echo('friends:tiny'),
    ],
]);