comment_excerpt( int|WP_Comment $comment_id )

Displays the excerpt of the current comment.

Parameters

$comment_id

(Optional) WP_Comment or ID of the comment for which to print the excerpt.<br> Default current comment.

Source

File: wp-includes/comment-template.php 

function comment_excerpt( $comment_ID = 0 ) {
	$comment         = get_comment( $comment_ID );
	$comment_excerpt = get_comment_excerpt( $comment );

	/**
	 * Filters the comment excerpt for display.
	 *
	 * @since WP-1.2.0
	 * @since WP-4.1.0 The `$comment_ID` parameter was added.
	 *
	 * @param string $comment_excerpt The comment excerpt text.
	 * @param int    $comment_ID      The comment ID.
	 */
	echo apply_filters( 'comment_excerpt', $comment_excerpt, $comment->comment_ID );
}

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Changelog

Changelog
Version Description
4.4.0 Added the ability for $comment_id to also accept a WP_Comment object.
1.2.0 Introduced.