twentynineteen_get_discussion_data()

53function twentynineteen_get_discussion_data() {54	static $discussion, $post_id;55 56	$current_post_id = get_the_ID();57	if ( $current_post_id === $post_id ) {58		return $discussion; /* If we have discussion information for post ID, return cached object */59	} else {60		$post_id = $current_post_id;61	}62 63	$comments = get_comments(64		array(65			'post_id' => $current_post_id,66			'orderby' => 'comment_date_gmt',67			'order'   => get_option( 'comment_order', 'asc' ), /* Respect comment order from Settings » Discussion. */68			'status'  => 'approve',69			'number'  => 20, /* Only retrieve the last 20 comments, as the end goal is just 6 unique authors */70		)71	);72 73	$authors = array();74	foreach ( $comments as $comment ) {75		$authors[] = ( (int) $comment->user_id > 0 ) ? (int) $comment->user_id : $comment->comment_author_email;76	}77 78	$authors    = array_unique( $authors );79	$discussion = (object) array(80		'authors'   => array_slice( $authors, 0, 6 ),           /* Six unique authors commenting on the post. */81		'responses' => get_comments_number( $current_post_id ), /* Number of responses. */82	);83 84	return $discussion;85}