gform filter for dynamically populating checkboxes and selects

gistfile1.txt

add_filter('gform_pre_render', 'cr_add_locations_to_select_hr');
add_filter('gform_pre_validation', 'cr_add_locations_to_select_hr');
add_filter('gform_pre_submission_filter', 'cr_add_locations_to_select_hr');
add_filter('gform_admin_pre_render', 'cr_add_locations_to_select_hr');
function cr_add_locations_to_select_hr($form)
{
    foreach ($form['fields'] as &$field) {

        if (strpos($field->cssClass, 'edit-post-populate-locations-hr') === false) {
            continue;
        }

        $choices = [];

        $locations = list_locations_hr();

        if (strpos($field->cssClass, 'no-id-values') === false) {
            foreach ($locations as $location) {
                $choices[] = ['text' => $location->post_title, 'value' => $location->ID];
            }
        } else {
            foreach ($locations as $location) {
                $choices[] = ['text' => $location->post_title, 'value' => $location->post_title];
            }
        }

        $field->placeholder = null;
        $field->choices = $choices;
    }

    return $form;
}