您必须列出元框中保存的元字段的键，因为它们没有动态检索特定元框中保存的所有字段的功能。例如：

$store_openingtimes_keys = array(
  \'_cmb_open_monday\', \'_cmb_open_tuesday\', \'_cmb_open_wednesday\', \'_cmb_open_thursday\',
  \'_cmb_open_friday\', \'_cmb_open_saturday\', \'_cmb_open_sunday\'
);
// all the not empty meta for the post
$meta = array_filter( get_post_custom($post->ID) );
// there are any not empty meta that is one of the store opening times?
$times_meta = array_intersect( array_keys($meta), $store_openingtimes_keys );
if ( ! empty($times_meta) ) { // if so, show content
   echo $content;
}