Question

如何检查有多少自定义字段具有帖子，我不想检索任何值，但我需要找出有多少自定义域具有帖子。

Answer 1

<?php
    // get only the keys as you only need the number
    $cfields = get_post_custom_keys($post_id);
    // num_cfields will store the number of custom fields
    $num_cfields = count($cfields);
?>

也有“http://codx.wordpress.org/Function_Reference/get_post_custer' rel=“nofollown noreferrer”>>get_post_cost 以及