BP_Messages_Thread::update_last_message_status( $data )

	public static function update_last_message_status( $data ) {
		extract( $data );

		if ( ! $deleted_recipients ) {
			return;
		}

		if ( ! $last_message ) {
			return;
		}

		foreach ( $deleted_recipients as $recipient ) {
			// use add to allow multiple values
			bp_messages_add_meta( $last_message->id, 'deleted_by', $recipient->user_id );
		}

		global $wpdb;
		$bp = buddypress();

		$wpdb->query( $wpdb->prepare( "
			UPDATE {$bp->messages->table_name_recipients}
			SET is_deleted = 0
			WHERE thread_id = %d
			AND user_id IN (%s)
		", $thread_id, implode( ',', wp_list_pluck( $deleted_recipients, 'user_id' ) ) ) );
	}