get_comment_author() WP 1.0

Retrieve the author of the current comment.

If the comment has an empty comment_author field, then 'Anonymous' person is assumed.

Hooks in function

Return

String. The comment author

Usage

get_comment_author( $comment_ID );

$comment_ID(int/WP_Comment)

WP_Comment or the ID of the comment for which to retrieve the author.
Default: current comment

Code of get comment author: wp-includes/comment-template.php ^{VER 5.0.3}

<?php
function get_comment_author( $comment_ID = 0 ) {
	$comment = get_comment( $comment_ID );

	if ( empty( $comment->comment_author ) ) {
		if ( $comment->user_id && $user = get_userdata( $comment->user_id ) )
			$author = $user->display_name;
		else
			$author = __('Anonymous');
	} else {
		$author = $comment->comment_author;
	}

	/**
	 * Filters the returned comment author name.
	 *
	 * @since 1.5.0
	 * @since 4.1.0 The `$comment_ID` and `$comment` parameters were added.
	 *
	 * @param string     $author     The comment author's username.
	 * @param int        $comment_ID The comment ID.
	 * @param WP_Comment $comment    The comment object.
	 */
	return apply_filters( 'get_comment_author', $author, $comment->comment_ID, $comment );
}

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From tag: Comments

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