这可能会有一些怪癖，但实际上它会满足您的需求。请注意，它设置为仅适用于帖子（不适用于页面或自定义帖子类型）。

我们所做的就是使用wp_unique_post_slug 过滤器，在WordPress生成自己独特的slug后运行，并根据所有_wp_old_slug 元值。您将在我的自定义查询中看到，我仍然在主posts表中对照slug进行检查-如果没有它，我们可能会“重置”后缀计数，并与现有post发生冲突。

function wpse_183975_unique_post_slug( $slug, $post_id, $post_status, $post_type ) {
    if ( $post_status === \'publish\' && $post_type === \'post\' ) {
        global $wpdb;

        if ( preg_match( \'/-([0-9]+)$/\', $slug, $match ) ) { // Already has a number suffix
            $slug_base = substr( $slug, 0, -strlen( $match[0] ) ); // Strip suffix from slug
            $i = ( int ) $match[1];
        } else { // No suffix, start at 1
            $slug_base = $slug;
            $i = 1;
        }

        while ( // For as long as there is an existing slug, increment the suffix
            $wpdb->get_var(
                $wpdb->prepare(
                    "SELECT m.post_id FROM $wpdb->postmeta AS m INNER JOIN $wpdb->posts AS p ON m.post_id = p.ID " .
                    "WHERE " .
                        "p.ID != %d AND " .
                        "p.post_type = \'post\' AND " .
                        "( p.post_status = \'publish\' AND p.post_name = %s ) OR " .
                        "( m.meta_key = \'_wp_old_slug\' AND m.meta_value = %s ) " .
                    "LIMIT 1",
                    $post_id,
                    $slug,
                    $slug
                )
            )
        ) {
            $slug = "$slug_base-" . ++$i;
        }
    }

    return $slug;
}

add_filter( \'wp_unique_post_slug\', \'wpse_183975_unique_post_slug\', 10, 4 );