为了子孙后代，以下是我最终要做的事情。

使用artist_sort_name 用于排序，只需将该字段中的值更改为artist_first_name 或artist_last_name （感谢s\\u ha\\u dums的回答）。

我正在使用WPAlchemy 类生成元数据库和自定义字段。我不得不打电话给save_filter 在保存之前运行函数（这是functions.php 文件）：

// Save filter function, check the value of alphabetize custom field
// if it\'s set then use first name as sort name
function nd_meta_sort($meta, $post_id) {
    if ($meta[\'alphabetize\'] == "alphabetize") {
        $meta[\'artist_sort_name\'] = $meta[\'artist_first_name\'];
    } else {
        $meta[\'artist_sort_name\'] = $meta[\'artist_last_name\'];
    }
    return $meta;
}

// Metabox for artists
$custom_metabox_artist = new WPAlchemy_MetaBox(array(
    \'id\'                 => \'artist_custom_meta\',
    \'title\'              => \'Artist Info\',
    \'template\'           => TEMPLATEPATH . \'/assets/meta-artists.php\',
    \'types\'              => array(\'artists\'),
    \'mode\'               => WPALCHEMY_MODE_EXTRACT,
    \'hide_screen_option\' => TRUE,
    \'save_filter\'        => \'nd_meta_sort\' // This get executed when saving the post
));

<table>
    <tbody>
        <tr>
            <th>
                <label>First Name:</label>
            </th>
            <td>
                <!-- Field for the first name -->
                <?php $mb->the_field(\'artist_first_name\'); ?>
                <input name="<?php $mb->the_name(); ?>" class="artist-name" type="text" value="<?php $mb->the_value(); ?>">
                <!-- Checkbox for for choosing which field to sort -->
                <span>
                    <?php $mb->the_field(\'alphabetize\'); ?>
                    <input type="checkbox" name="<?php $mb->the_name(); ?>" value="alphabetize" <?php $mb->the_checkbox_state(\'alphabetize\'); ?>>
                    Alphabetize First Name
                </span>
            </td>
        </tr>
        <tr>
            <th>
                <label>Lastname:</label>
            </th>
            <td>
                <!-- Field for the last name -->
                <?php $mb->the_field(\'artist_last_name\'); ?>
                <input name="<?php $mb->the_name(); ?>" class="artist-name" type="text" value="<?php $mb->the_value(); ?>">
            </td>
        </tr>
    </tbody>
</table>
<!-- The field the post are sorted to. Note that it\'s hidden -->
<?php $mb->the_field(\'artist_sort_name\'); ?>
<input name="<?php $mb->the_name(); ?>" class="artist-name sort-name" type="hidden" value="<?php $mb->the_value(); ?>">

它看起来像这样：

为了完整起见，这是一个让艺术家们着迷的循环。我正在使用pre_get_posts 在里面functions.php:

function artist_list($query) {
    if ( is_admin() || ! $query->is_main_query() ) {
        return;
    }
    // Target the artists page
    if (is_tax(\'artist-category\')) {
        $query->set(\'posts_per_page\', \'-1\');
        $query->set(\'orderby\', \'meta_value\');
        $query->set(\'meta_key\', "artist_sort_name");
        $query->set(\'order\', \'ASC\');
    }
}
add_action(\'pre_get_posts\', \'artist_list\');