如何閱讀Amazon SNS JSON響應

Question

如何從Amazon SNS對http端點的響應中獲取TranscriptionJobName和TranscriptionJobStatus？

當我在下面嘗試我的代碼時，文本文件中的name變量為空，但是來自Amazon的消息記錄到我的file.txt中就可以了。

我從file.txt中的SNS得到什么（省略了一些值）：

Array
(
    [Type] => Notification
    [MessageId] => MSG_ID
    [TopicArn] => TOPIC_ARN
    [Message] => {"version":"0","id":"msg_id","detail-type":"Transcribe Job State Change","source":"aws.transcribe","account":"account_number","time":"2019-03-07T18:19:08Z","region":"us-east-1","resources":[],"detail":{"TranscriptionJobName":"702edfc","TranscriptionJobStatus":"COMPLETED"}}
    [Timestamp] => 2019-03-07T18:19:09.194Z
    [SignatureVersion] => 1
    [Signature] => sign==
    [SigningCertURL] => sign_cert.pem
    [UnsubscribeURL] => unsubscribe_url
)

我從namer.txt得到的結果是：

{

我的代碼能夠讀取發送到端點的消息，但是嘗試進一步解析為響應，將在我用來調試的txt文件中返回空白。

我的代碼嘗試：

    //Endpoint.php

 //Fetch the raw POST body containing the message
    $postBody = file_get_contents('php://input');

    // JSON decode the body to an array of message data
    $message = json_decode($postBody, true);


    if ($message) {

    //just for debugging put entire response in file.txt
    file_put_contents('file.txt', print_r($message, true));


    //if its a Notification 

    if ($message['Type'] === 'Notification'){

     //then get the name of the Transcription Job 

        $name = $message['Message']['detail'][0]['TranscriptionJobName'];

    //put that into namer.txt
        file_put_contents('namer.txt', $name,true);






                                }

    }

Answer 1

由於某種原因，似乎$message['Message']仍然是字符串而不是數組。

您需要先對其進行解碼，然后才能訪問其中的元素：

// Decode
$message['Message'] = json_decode($message['Message'], true);

// Now you can access it using:
$name = $message['Message']['detail']['TranscriptionJobName'];