wordpress remove user roles
//REMOVE UNUSED ROLES
add_action('admin_menu', 'remove_built_in_roles');
function remove_built_in_roles() {
global $wp_roles;
$roles_to_remove = array('subscriber', 'contributor', 'author', 'editor');
foreach ($roles_to_remove as $role) {
if (isset($wp_roles->roles[$role])) {
$wp_roles->remove_role($role);
}
}
}