Wp_Query 应该可以为你做这件事。传递适当的参数，包括tax_query, 和检查found_posts.

$p = new WP_Query(
  array(
    \'post_type\' => \'custcpt\', // your CPT
    \'tax_query\' => array(
      array(
        \'taxonomy\' => \'custtax\', // your tax
        \'field\' => \'id\',
        \'terms\' => $cat->term_id, // your term ID
      )
    ), 
    \'ignore_stickie_posts\' => true,
    \'fields\' => \'ids\',
  )
);
echo $p->found_posts;

如果分类法仅附加到一个帖子类型，则可以使用term_taxonomy.count 表列。

SELECT t.name , tt.count FROM wp_terms t
JOIN wp_term_taxonomy tt ON tt.term_taxonomy_id = t.term_id
Where t.name=\'3d\'

I solved it:

SELECT t.name, count(*) FROM wp_terms t
JOIN wp_term_taxonomy tt ON tt.term_id = t.term_id
JOIN wp_term_relationships tr ON tr.term_taxonomy_id = tt.term_taxonomy_id
JOIN wp_posts p ON p.id=tr.object_id
WHERE t.name = \'3d\'