您不能在以后的帖子中启用评论。这些帖子既不是公开的，也不是私有的，因此它们在wp-comments-post.php 文件该条件为（WP 4.1.1）：

} elseif ( ! $status_obj->public && ! $status_obj->private ) {
    /**
     * Fires when a comment is attempted on a post in draft mode.
     *
     * @since 1.5.1
     *
     * @param int $comment_post_ID Post ID.
     */
    do_action( \'comment_on_draft\', $comment_post_ID );
    exit;
}

要允许在预定帖子中添加评论，您可以加入comment_on_draft 操作并从中复制插入注释代码wp-comments-post.php 在回调函数内部。

add_action( \'comment_on_draft\', function( $comment_post_ID ) {

    do_action( \'pre_comment_on_post\', $comment_post_ID );

    $comment_author       = ( isset($_POST[\'author\']) )  ? trim(strip_tags($_POST[\'author\'])) : null;
    $comment_author_email = ( isset($_POST[\'email\']) )   ? trim($_POST[\'email\']) : null;
    $comment_author_url   = ( isset($_POST[\'url\']) )     ? trim($_POST[\'url\']) : null;
    $comment_content      = ( isset($_POST[\'comment\']) ) ? trim($_POST[\'comment\']) : null;

    // If the user is logged in
    $user = wp_get_current_user();
    if ( $user->exists() ) {
        if ( empty( $user->display_name ) )
            $user->display_name=$user->user_login;
        $comment_author       = wp_slash( $user->display_name );
        $comment_author_email = wp_slash( $user->user_email );
        $comment_author_url   = wp_slash( $user->user_url );
        if ( current_user_can( \'unfiltered_html\' ) ) {
            if ( ! isset( $_POST[\'_wp_unfiltered_html_comment\'] )
        || ! wp_verify_nonce( $_POST[\'_wp_unfiltered_html_comment\'], \'unfiltered-html-comment_\' . $comment_post_ID )
            ) {
                kses_remove_filters(); // start with a clean slate
                kses_init_filters(); // set up the filters
            }
        }
    } else {
        if ( get_option( \'comment_registration\' ) || \'private\' == $status ) {
            wp_die( __( \'Sorry, you must be logged in to post a comment.\' ), 403 );
        }
    }

    $comment_type = \'\';

    if ( get_option(\'require_name_email\') && !$user->exists() ) {
        if ( 6 > strlen( $comment_author_email ) || \'\' == $comment_author ) {
            wp_die( __( \'<strong>ERROR</strong>: please fill the required fields (name, email).\' ), 200 );
        } else if ( ! is_email( $comment_author_email ) ) {
            wp_die( __( \'<strong>ERROR</strong>: please enter a valid email address.\' ), 200 );
        }
    }

    if ( \'\' == $comment_content ) {
        wp_die( __( \'<strong>ERROR</strong>: please type a comment.\' ), 200 );
    }

    $comment_parent = isset($_POST[\'comment_parent\']) ? absint($_POST[\'comment_parent\']) : 0;

    $commentdata = compact(\'comment_post_ID\', \'comment_author\', \'comment_author_email\', \'comment_author_url\', \'comment_content\', \'comment_type\', \'comment_parent\', \'user_ID\');

    $comment_id = wp_new_comment( $commentdata );
    if ( ! $comment_id ) {
        wp_die( __( "<strong>ERROR</strong>: The comment could not be saved. Please try again later." ) );
    }

    $comment = get_comment( $comment_id );

    /**
    * Perform other actions when comment cookies are set.
    *
    * @since 3.4.0
    *
    * @param object $comment Comment object.
    * @param WP_User $user   User object. The user may not exist.
    */
    do_action( \'set_comment_cookies\', $comment, $user );

    $location = empty($_POST[\'redirect_to\']) ? get_comment_link($comment_id) : $_POST[\'redirect_to\'] . \'#comment-\' . $comment_id;

    /**
    * Filter the location URI to send the commenter after posting.
    *
    * @since 2.0.5
    *
    * @param string $location The \'redirect_to\' URI sent via $_POST.
    * @param object $comment  Comment object.
    */
    $location = apply_filters( \'comment_post_redirect\', $location, $comment );

    wp_safe_redirect( $location );
    exit;

});

此外，我们可以检查“未来”状态以排除“草稿”帖子，但在这种情况下，我们可能会与使用comment_on_draft 行动挂钩：

add_action( \'comment_on_draft\', function( $comment_post_ID ) {

    if( get_post_status( $comment_post_ID ) != \'future\' ) {
        exit;
    }

    //Rest of the code

});