February 12, 2011 
Definition:
function get_comment_author( $comment_ID = 0 ) {}
Retrieve the author of the current comment.
If the comment has an empty comment_author field, then ‘Anonymous’ person is assumed.
Parameters
- int $comment_ID: The ID of the comment for which to retrieve the author. Optional.
Return values
returns:The comment author
Defined filters
- get_comment_author
apply_filters('get_comment_author', $author)
Source code
function get_comment_author( $comment_ID = 0 ) {
$comment = get_comment( $comment_ID );
if ( empty($comment->comment_author) ) {
if (!empty($comment->user_id)){
$user=get_userdata($comment->user_id);
$author=$user->user_login;
} else {
$author = __('Anonymous');
}
} else {
$author = $comment->comment_author;
}
return apply_filters('get_comment_author', $author);
}
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