您可以使用get_comments() 用于检索注释的函数user_id 或者您也可以修改以下内容以接受author_email 或多个作者。然后，它将只以数组形式返回注释ID并对其进行计数，返回的整数可以是0。

/**
 * Count and return number of comments by User ID
 *
 * @param Integer $user_id - User ID of the wanted user
 *
 * @return Integer - Number of comments by given user
 */
function wpse284435_comment_count_by_author( $user_id ) {

    $user_id    = ( ! empty( $user_id ) ) ? intval( $user_id ) : get_current_user_id();
    $comments   = get_comments( array(
        \'fields\'    => \'ids\',
        \'user_id\'   => $user_id,
    ) );

    return count( $comments );

}

$comment_count = wpse284435_comment_count_by_author( 7 );