num_display.php

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<?php
$widget = elgg_extract('entity', $vars);
if (!($widget instanceof \ElggWidget)) {
    return;
}
unset($vars['widget']);

$name = elgg_extract('name', $vars, 'num_display');
$vars['name'] = "params[{$name}]";

if (!isset($vars['label'])) {
    $vars['label'] = elgg_echo('widget:numbertodisplay');
}
$vars['#label'] = $vars['label'];
unset($vars['label']);

if (!isset($vars['options'])) {
    $vars['options'] = [5, 8, 10, 12, 15, 20];
}

$value = sanitize_int($widget->$name, false);
if (!$value) {
    $value = elgg_extract('default', $vars, $vars['options'][0]);
}
$vars['value'] = $value;
$vars['#type'] = 'select';

echo elgg_view_field($vars);