function get_custom_post_extended() {
    $args = array('post_type' => 'page');
    $customLoop = new WP_Query($args);

    $all_post_type  = array(
        'books',
        'reviews',
        'news',
        'overviews',
        'texts',
        'interviews',
        'chronicles',
        'afisha',
    );

    while ($customLoop->have_posts()) :
        $customLoop->the_post();
        $get_type = get_post_meta(get_the_ID(), 'custom_type')[0];

        if ($get_type != NULL) {
            array_push( $all_post_type, $get_type);
        }
    endwhile;

    return $all_post_type;
}