wp-includes/feed.php:291Retrieves the feed GUID for the current comment.
$comment_idint|WP_Commentoptionalnullstring|falsefunction get_comment_guid( $comment_id = null ) { $comment = get_comment( $comment_id ); if ( ! is_object( $comment ) ) { return false; } return get_the_guid( $comment->comment_post_ID ) . '#comment-' . $comment->comment_ID;}Introduced in 2.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/feed.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.