在 PHP 中从 SimpleXML 对象中检索值

Question

$bbb = new BigBlueButton();

$recordingsParams = array(
    'meetingId' => '', 

);

// Now get recordings info and display it:
$itsAllGood = true;
try {$result = $bbb->getRecordingsWithXmlResponseArray($recordingsParams);}
    catch (Exception $e) {
        echo 'Caught exception: ', $e->getMessage(), "\n";
        $itsAllGood = false;
    }

    if ($itsAllGood == true) {
        if ($result == null) {
            echo "Failed to get any response. Maybe we can't contact the BBB server.";
        }   
        else { 

         if ($result['returncode'] == 'SUCCESS') {
                echo "<p>Meeting info was found on the server.</p>";
            }


            else {
                echo "<p>Failed to get meeting info.</p>";
            }
            print_r($result);

        }
    }

When I am using Bigbluebutton, I need to retrieve the particular data from these XML format response. I don't know how to retrieve the particular data from these XML format?

Array
(
    [returncode] => SimpleXMLElement Object
        (
            [0] => SUCCESS
        )

    [0] => Array
        (
            [meetingId] => SimpleXMLElement Object
                (
                    [0] => newtech
                )                       
         )

    [1] => Array
        (
            [meetingId] => SimpleXMLElement Object
                (
                    [0] => menew
                )                          
        )  
)

I need to display the values of meetingId.

Answer 1

If you'd rather work with arrays you can cast the XML as well. This function returns an array with info on what is going on on your server if called (improvements still very welcome):

    function getServerInfo() {
        $url="https://you-bbb-server-api-getMeetings-call-url";
        $a= (array)new SimpleXMLElement(file_get_contents($url));
        if($a["returncode"]=="SUCCESS") {
            if($a["meetings"]) {
               foreach($a["meetings"] as $meeting) {
                    $meeting=(array)$meeting;
                    $data["Meetings"][$meeting["meetingID"]]["Teilnehmer"]=$meeting["participantCount"];
                    $data["Meetings"][$meeting["meetingID"]]["Name"]=$meeting["meetingName"];
                    $data["Gesamt"]+=(int)$meeting["participantCount"];
                    $data["Anzahl"]++;
                    $data["Meetings"][$meeting["meetingID"]]["Video"]=$meeting["videoCount"];
                    $data["Meetings"][$meeting["meetingID"]]["Start"]=date('d.m.Y H:i:s',floor($meeting["startTime"]/1000));
                    if($meeting["attendees"]) foreach($meeting["attendees"] as $att) {
                        $att=(array)$att;
                        if($att["role"]=="MODERATOR") $data["Meetings"][$meeting["meetingID"]]["Liste"]["M"]=array($att["fullName"],($att["hasJoinedVoice"]=="true")? 1:0,($att["hasVideo"]=="true")? 1:0);
                        else $data["Meetings"][$meeting["meetingID"]]["Liste"]["T"][]=array($att["fullName"],($att["hasJoinedVoice"]=="true")? 1:0,($att["hasVideo"]=="true")? 1:0);
                    }
                }
                return($data);
            } else return(array("Anzahl"=>0,"Gesamt"=>0));
        } else return(-1);
    }