这是假设每个字段都是一个值，并且您希望创建一个列表以显示。。。

add_action(\'edit_post\',\'custom_combine_fields\');

function custom_combine_fields($post_id) {

    $pirates = get_post_meta($post_id,\'pirates\',true);
    $robots = get_post_meta($post_id,\'robots\',true);
    $ninjas = get_post_meta($post_id,\'ninjas\',true);

    $professions = array();
    if ($pirates) {$professions[] = $pirates;}
    if ($robots) {$professions[] = $robots;}
    if ($ninjas) {$professions[] = $ninjas;}

    if (count($professions) > 0) {
        $professions = implode(\', \',$professions);
        update_post_meta($post_id,\'professions\',$professions);
    }
}