这个WP_Comment_Query 班supports 订购人：

\'comment_agent\',
\'comment_approved\', 
\'comment_author\',
\'comment_author_email\', 
\'comment_author_IP\',
\'comment_author_url\', 
\'comment_content\', 
\'comment_date\',
\'comment_date_gmt\', 
\'comment_ID\', 
\'comment_karma\',
\'comment_parent\', 
\'comment_post_ID\', 
\'comment_type\',
\'user_id\', 
\'comment__in\', 
\'meta_value\', 
\'meta_value_num\',

有一种方法可以通过过滤器进行调整，因此我们可以支持按帖子标题排序：

$args = [
    \'status\'       => \'approve\',
    \'post_status\'  => \'publish\',
    \'post_type\'    => \'post\',
    \'orderby\'      => \'_post_title\', // <-- Our custom orderby value
    \'order\'        => \'DESC\'
];

$comment_query = new WP_Comment_Query( $args ); 

一个简单的演示插件，支持_post_title 订购可以使用PHP 7：

/**
 * Adjust orderby comments clause
 */

add_filter( \'comments_clauses\', function( $clauses, \\WP_Comment_Query $cq ) use ( &$wpdb )
{   
    $qv      = $cq->query_vars;
    $orderby = $qv[\'orderby\'] ?? \'\';
    $order   = $qv[\'order\'] ?? \'ASC\';

    if( 
           \'_post_title\' === $orderby 
        && in_array( strtoupper( $order ), [ \'ASC\', \'DESC\' ], true ) 
    )
        $clauses[ \'orderby\' ] = " {$wpdb->posts}.post_title {$order},
            {$wpdb->comments}.comment_ID {$order} "; 


    return $clauses;
}, 10, 2 );

然后，为了确保posts表已连接到comment表，如果缺少post type参数，我们可以将其设置为“post”：

/**
 * Make usre we have the posts table joined by making sure the post_type isn\'t empty.
 */

add_action( \'pre_get_comments\', function( \\WP_Comment_Query $cq )
{
    $qv      = &$cq->query_vars;
    $orderby = $qv[\'orderby\'] ?? \'\';

    if( \'_post_title\' === $orderby && empty( $qv[\'post_type\'] ) )
        $qv[\'post_type\'] = \'post\';

} );

请注意，此类查询：

SELECT  wp_comments.comment_ID 
    FROM wp_comments JOIN wp_posts ON wp_posts.ID = wp_comments.comment_post_ID     
    WHERE ( comment_approved = \'1\' ) 
        AND  wp_posts.post_status IN (\'publish\') 
        AND  wp_posts.post_type IN (\'post\')  
    ORDER BY  wp_posts.post_title DESC, wp_comments.comment_ID DESC  

由于使用临时文件和文件排序，因此效率不高。

希望您能根据需要进一步调整。