你可以create a new query 对于自定义帖子类型中的所有帖子，然后遍历每个帖子并将其与当前帖子id匹配，以确定其位置。

// save current id to match later
$current_project_id = $post->ID;

$args = array(
    \'post_type\' => \'project\',
    \'posts_per_page\' => -1
);
$all_projects = new WP_Query( $args );

while( $all_projects->have_posts() ) : $all_projects->the_post();

    // simple \'if\' test to find the current post in the loop
    // note that current_post starts at zero, which is why we add 1 to it.
    // you can also output the_title, the_permalink, thumbnails, etc..

    if( $post->ID == $current_project_id ):
        echo "project " . ( $all_projects->current_post + 1 ) . " of " . $all_projects->post_count;
    endif;

endwhile;