Rest_BBP_Walker_Reply::start_el( $output,  $object,  $depth,  $args = array(),  $current_object_id )

	public function start_el( &$output, $object, $depth = 0, $args = array(), $current_object_id = 0 ) {
		global $buddyboss_thread_reply;

		// Set up reply
		$depth++;
		$object->depth                         = $depth;
		$buddyboss_thread_reply[ $object->ID ] = $object;
	}