BBP_BuddyPress_Activity::reply_create( $reply_id, int $topic_id, int $forum_id, array $anonymous_data = array(),  $reply_author_id )

	public function reply_create( $reply_id = 0, $topic_id = 0, $forum_id = 0, $anonymous_data = array(), $reply_author_id = 0 ) {

		// Do not log activity of anonymous users
		if ( !empty( $anonymous_data ) )
			return;

		// Validate activity data
		$user_id  = (int) $reply_author_id;
		$reply_id = bbp_get_reply_id( $reply_id );
		$topic_id = bbp_get_topic_id( $topic_id );
		$forum_id = bbp_get_forum_id( $forum_id );

		// Bail if user is not active
		if ( bbp_is_user_inactive( $user_id ) )
			return;

		// Bail if reply is not published
		if ( !bbp_is_reply_published( $reply_id ) )
			return;

		// Setup links for activity stream
		$user_link = bbp_get_user_profile_link( $user_id  );

		// Reply
		$reply_url     = bbp_get_reply_url( $reply_id );
		$reply_content = get_post_field( 'post_content', $reply_id, 'raw' );

		// Topic
		$topic_permalink = bbp_get_topic_permalink( $topic_id );
		$topic_title     = get_post_field( 'post_title', $topic_id, 'raw' );
		$topic_link      = '<a href="' . $topic_permalink . '">' . $topic_title . '</a>';

		// Forum
		$forum_permalink = bbp_get_forum_permalink( $forum_id );
		$forum_title     = get_post_field( 'post_title', $forum_id, 'raw' );
		$forum_link      = '<a href="' . $forum_permalink . '">' . $forum_title . '</a>';

		// Activity action & text
		$activity_text    = sprintf( esc_html__( '%1$s replied to the discussion %2$s in the forum %3$s', 'buddyboss' ), $user_link, $topic_link, $forum_link );
		$activity_action  = apply_filters( 'bbp_activity_reply_create',         $activity_text, $user_id, $reply_id,  $topic_id );
		$activity_content = apply_filters( 'bbp_activity_reply_create_excerpt', $reply_content                                  );

		// Compile and record the activity stream results
		$activity_id = $this->record_activity( array(
			'id'                => $this->get_activity_id( $reply_id ),
			'user_id'           => $user_id,
			'action'            => $activity_action,
			'content'           => $activity_content,
			'primary_link'      => $reply_url,
			'type'              => $this->reply_create,
			'item_id'           => $reply_id,
			'secondary_item_id' => $topic_id,
			'recorded_time'     => get_post_time( 'Y-m-d H:i:s', true, $reply_id ),
			'hide_sitewide'     => ! bbp_is_forum_public( $forum_id, false )
		) );

		// Add the activity entry ID as a meta value to the reply
		if ( !empty( $activity_id ) ) {
			update_post_meta( $reply_id, '_bbp_activity_id', $activity_id );
		}
	}