一种可能的方法是使用role__not_in 类似so的参数，它排除了除subscriber:

// Include only the following role(s):
$roles_in = array( \'subscriber\' );

$roles_not_in = array_diff(
    array_keys( wp_roles()->get_names() ),
    $roles_in
);

$args = array(
    \'role__not_in\' => $roles_not_in,
);

$subscribers = get_users( $args );