php - 无法进行 json_decode

Question

我正在将数据从 Vb.net 客户端发布到 PHP rest api，但由于某种原因，json_decode 无法处理传递的字符串。发布到服务器的代码是:

        Dim payload As String = "{""key"":""Test"",""bookings"":" & txtUpload.Text & "}"

        Dim request As WebRequest = WebRequest.Create(String.Format(baseAPIImportUrl))
        ' Set the Method property of the request to POST.  
        request.Method = "POST"
        ' Create POST data and convert it to a byte array.  
        Dim byteArray() As Byte = Encoding.UTF8.GetBytes(payload)
        ' Set the ContentType property of the WebRequest.  
        request.ContentType = "application/x-www-form-urlencoded"
        ' Set the ContentLength property of the WebRequest.  
        request.ContentLength = byteArray.Length
        ' Get the request stream.  
        Dim dataStream As Stream = request.GetRequestStream
        ' Write the data to the request stream.  
        dataStream.Write(byteArray, 0, byteArray.Length)
        ' Close the Stream object.  
        dataStream.Close()
        ' Get the response.  
        Dim response As WebResponse = request.GetResponse
        ' Display the status.  
        MessageBox.Show(CType(response, HttpWebResponse).StatusDescription)
        ' Get the stream containing content returned by the server.  
        dataStream = response.GetResponseStream
        ' Open the stream using a StreamReader for easy access.  
        Dim reader As StreamReader = New StreamReader(dataStream)
        ' Read the content.  
        Dim responseFromServer As String = reader.ReadToEnd
        ' Display the content.  
        ' Console.WriteLine(responseFromServer)
        MessageBox.Show(responseFromServer)
        ' Clean up the streams.  
        reader.Close()
        dataStream.Close()
        response.Close()

传递的值:

{"key":"91a1522Test",
 "bookings":
   {"booking":[{"ClassId":"4",  "ClassName":"THOASC",   "YearWeek":"1751"}]} }

在 PHP 方面，我这样做:

$bookings = $_POST->bookings
$data = json_decode($bookings,true);
$total = count($data['booking']);

$total 应该显示 1，因为预订数组中有 1 个项目，但它始终显示 0

Answer 1

$_POST->bookings - 这是你的问题。 ->是对象访问操作符，但是在PHP中，$_POST不是对象而是数组。

如果您将此值作为表单数据的一部分提交，您通常会通过数组语法访问它(例如 $_POST['bookings'])，但是来自您的 VB 代码，您实际上是将 JSON 字符串作为 POST 主体本身发布。

在 PHP 中，您可以像这样访问原始 POST 正文:

$bookings = file_get_contents('php://input');

您的其余代码应该照常工作。

编辑:实际上，您也有错字。尝试

$total = count($data['bookings']);
// or
$total = count($data['bookings']['booking']);