<?php
function get_comment_author( $comment_id = 0 ) {
$comment = get_comment( $comment_id );
if ( ! empty( $comment->comment_ID ) ) {
$comment_id = $comment->comment_ID;
} elseif ( is_scalar( $comment_id ) ) {
$comment_id = (string) $comment_id;
} else {
$comment_id = '0';
}
if ( empty( $comment->comment_author ) ) {
$user = ! empty( $comment->user_id ) ? get_userdata( $comment->user_id ) : false;
if ( $user ) {
$comment_author = $user->display_name;
} else {
$comment_author = __( 'Anonymous' );
}
} else {
$comment_author = $comment->comment_author;
}