bp_get_message_thread_total_count( int|bool $thread_id = false )

	function bp_get_message_thread_total_count( $thread_id = false ) {
		if ( false === $thread_id ) {
			$thread_id = bp_get_message_thread_id();
		}

		$thread_template = new BP_Messages_Thread_Template( $thread_id, 'ASC', array(
			'update_meta_cache' => false
		) );

		$count = 0;
		if ( ! empty( $thread_template->message_count ) ) {
			$count = intval( $thread_template->message_count );
		}

		/**
		 * Filters the current thread's total message count.
		 *
		 * @since BuddyPress 2.2.0
		 * @since BuddyPress 2.6.0 Added the `$thread_id` parameter.
		 *
		 * @param int $count     Current thread total message count.
		 * @param int $thread_id ID of the queried thread.
		 */
		return apply_filters( 'bp_get_message_thread_total_count', $count, $thread_id );
	}