Array
(
    [paged] => 3
    [post_type] => masterclass
    [ignore_sticky_posts] => 1
    [meta_query] => Array
        (
            [0] => Array
                (
                    [key] => nascondi_tra_gli_articoli
                    [compare] => !=
                    [value] => 1
                )

            [1] => Array
                (
                    [key] => nascondi_tra_gli_articoli
                    [compare] => NOT EXISTS
                )

            [relation] => OR
        )

)