返回 php 中的实例化类.大蓝按钮

我是PHP的新手，正在尝试第三方代码，即蓝色大按钮api。https://github.com/bigbluebutton/bigbluebutton/tree/master/labs/bbb-api-php

我尝试调用BigBlueButton->createMeeting()看起来像这样的函数：

public function createMeeting($createMeetingParams, $xml = '')
{
    $xml = $this->processXmlResponse($this
        ->getCreateMeetingURL($createMeetingParams), $xml);
    //$xml is fine
    return new CreateMeetingResponse($xml);
}

创建会议响应类

  namespace BigBlueButton'Responses;
/**
 * Class CreateMeetingResponse
 * @package BigBlueButton'Responses
 */
class CreateMeetingResponse extends BaseResponse
{
    /**
     * @return string
     */
    public function getMeetingId()
    {
        return $this->rawXml->meetingID->__toString();
    }
    /**
     * @return string
     */
    public function getAttendeePassword()
    {
        return $this->rawXml->attendeePW->__toString();
    }
    /**
     * @return string
     */
    public function getModeratorPassword()
    {
        return $this->rawXml->moderatorPW->__toString();
    }
    /**
     * Creation timestamp.
     *
     * @return double
     */
    public function getCreationTime()
    {
        return doubleval($this->rawXml->createTime);
    }
    /**
     * @return int
     */
    public function getVoiceBridge()
    {
        return intval($this->rawXml->voiceBridge);
    }
    /**
     * @return string
     */
    public function getDialNumber()
    {
        return $this->rawXml->dialNumber->__toString();
    }
    /**
     * Creation date at the format "Sun Jan 17 18:20:07 EST 2016".
     *
     * @return string
     */
    public function getCreationDate()
    {
        return $this->rawXml->createDate->__toString();
    }
    /**
     * @return true
     */
    public function hasUserJoined()
    {
        return $this->rawXml->hasUserJoined->__toString() == 'true';
    }
    /**
     * @return int
     */
    public function getDuration()
    {
        return intval($this->rawXml->duration);
    }
    /**
     * @return bool
     */
    public function hasBeenForciblyEnded()
    {
        return $this->rawXml->hasBeenForciblyEnded->__toString() == 'true';
    }
    /**
     * @return string
     */
    public function getMessageKey()
    {
        return $this->rawXml->messageKey->__toString();
    }
    /**
     * @return string
     */
    public function getMessage()
    {
        $this->rawXml->message->__toString();
    }
}

基本响应类

namespace BigBlueButton'Parameters;
/**
 * Class BaseParameters.
 */
abstract class BaseParameters
{
    /**
     * @param $array
     *
     * @return string
     */
    protected function buildHTTPQuery($array)
    {
        return http_build_query(array_filter($array));
    }
    /**
     * @return string
     */
    abstract public function getHTTPQuery();
}

现在当我调用 BigBlueButton->createMeeting() 函数时，我期待一个可以编码为 json 的对象，但我得到的是这个（我在这里使用了print_r()..）：

BigBlueButton'Responses'CreateMeetingResponse Object
(
    [rawXml:protected] => SimpleXMLElement Object
        (
            [returncode] => FAILED
            [messageKey] => idNotUnique
            [message] => A meeting already exists with that meeting ID.  Please use a different meeting ID.
        )
)

我不确定发生了什么，但我认为前缀命名空间' BigBlueButton'Responses'CreateMeetingResponse Object '是问题所在。我想解析我在 php 中得到的对 json 对象的响应，但不能

这是我尝试解析它的地方

function easymeet_create_meeting($id) {
  // Create BBB object
  $bbb = new BigBlueButton'BigBlueButton();
  //creating meeting parameter
  $meetingParas=new BigBlueButton'Parameters'CreateMeetingParameters('123456','sned');
  //Creatign meeting
  return json_encode($bbb->createMeeting($meetingParas)); 
   ///print_r($bbb->createMeeting($meetingParas)) give the xml response shown above
}