master/hidden_8php_source.html

 <?php
 $vars['type'] = 'hidden';

 echo elgg_format_element('input', $vars);
$vars
$vars['type']
Create a hidden data field.
Definition: hidden.php:8

elgg_format_element
elgg_format_element(string $tag_name, array $attributes=[], string $text= '', array $options=[])
Format an HTML element.
Definition: output.php:145