edit.php

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<?php
$num_display = sanitize_int($vars['entity']->num_display, false);
// set default value for display number
if (!$num_display) {
    $num_display = 8;
}

$params = array(
    'name' => 'params[num_display]',
    'value' => $num_display,
    'options' => array(5, 8, 10, 12, 15, 20),
);
$dropdown = elgg_view('input/select', $params);

?>
<p>
    <?php echo elgg_echo('widget:numbertodisplay'); ?>:
    <?php echo $dropdown; ?>
</p>