我在我的代码中使用了一个Cassandra类，这个错误总是出现“尝试从命名空间加载类你是否忘记了另一个命名空间的”use“语句？”这是我的代码
DefaultController
<?php
namespace Acme\SampleBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Cassandra;
class DefaultController extends Controller
{
public function indexAction()
{
$con = new Cassandra\Timestamp();
echo $con;
}
}
Timestap.php
<?php
/**
* Copyright 2015-2016 DataStax, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace Cassandra;
/**
* A PHP representation of the CQL `timestamp` datatype
*/
final class Timestamp implements Value
{
/**
* Creates a new timestamp from either unix timestamp and microseconds or
* from the current time by default.
*
* @param int $time Unix timestamp
* @param int $usec Microseconds
*/
public function __construct($time = null, $usec = null) {}
/**
* The type of this timestamp.
*
* @return Type
*/
public function type() {}
/**
* Unix timestamp.
*
* @return int seconds
* @see time
*/
public function time() {}
/**
* Microtime from this timestamp
*
* @param bool $get_as_float Whether to get this value as float
*
* @return float|string Float or string representation
* @see microtime
*/
public function microtime($get_as_float = false) {}
/**
* Converts current timestamp to PHP DateTime.
*
* @return \DateTime PHP representation
*/
public function toDateTime() {}
/**
* Returns a string representation of this timestamp.
*
* @return string timestamp
*/
public function __toString() {}
}
我不知道我的代码有什么问题，我是使用Cassandra和symfony的新手