[PHP][WORDPRESS] Get users email by role

functions.php

<?php

function get_users_email_by_role($role)
{
    $args = array(
        'role'    => $role,
    );
    $users = get_users($args);
    $emails = array();
    foreach ($users as $user) {
        $email = $user->user_email;
        array_push($emails, $email);
    }
    return $emails;
}