General developer forum

 See this post can help you.

I am using like this on my project.

types = array(
    '1' => checkbox1,
    '2' => checkbox2
)
$typeitem = array();
foreach ($types as $key => $value) {
 $typeitem[] = &$mform->createElement('advcheckbox',$key, '', $value, array('name' => $key,'group'=>1), $key);
 $mform->setDefault("types[$key]", true);
}
$mform->addGroup($typeitem, 'types',get_string('types'));
$this->add_checkbox_controller(1);