PHP: custom email shortcodes - email addresses of role

I never had a requirement from a client for a custom shortcode on the backend of a form. Shortcodes are shortcodes though. Creating a shortcode for Formidable is done the same way you would create any shortcode. What gives me pause is that Formidable made changes to the way 3rd party shortcodes are processed way back in version 2.0.9 around June 2015. They basically had to lock down the use of 3rd party shorcodes due to a discovered security vulnerability. There is a workaround that allows you to execute a 3rd party shortcode. Your custom shortcode would be considered a 3rd party shortcode. This article explains the details and has a code example that you can modify to make your shortcode work with Formidable, if it doesn't work out of the gate, that is. https://victorfont.com/formidable-pro-3rd-party-shortcodes/

Cool.  I added shortcode to get emails to my theme code and it seems to work well.

/**
* my_email shortcode
*
* attributes:
* role= Give role name
*
*/

function my_email($params)
{
$params = shortcode_atts(
array(
'role' => null,
), $params, 'my_email' );

$args = array();

if ($params['role'])
{
$args['role'] = $params['role'];
}

if ($args)
{
$emails = array();

$users = get_users( $args );

if ($users)
{
foreach ($users as $user)
{
$emails []= $user->user_email;
}

$email_list = implode(", ", array_unique($emails));
}

if ($email_list == null)
{
$email_list = get_bloginfo('admin_email');
}
}

return $email_list;
}

add_shortcode('my_email', 'my_email');