递归验证用户输入有关问题

	function checkenter($canshu){

	        //验证输入

		$obj = new base($canshu);

		$re1 = $obj->list_tables($canshu);

			

		//如果验证不通过

                if($re1 === false){

			echo "The '$canshu' was not found, Please input again \n";

			//再次要求输入

                        $canagin = enter();

			//递归验证

                        checkenter($canagin);

		}

		return $canshu;

		

	}

       $result = checkenter($canshu);

	var_dump( $result);