Question

我将数据从Vb.net客户端发布到PHP rest api，但由于某种原因，json_decode不能处理传递的字符串。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()

正在传递的值：

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

在PHP方面我做：

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

$ total应显示1，因为预订数组中有1个项目，但总是显示为0

Answer 1

$_POST->bookings - 这是你的问题。 ->是对象访问运算符，但在PHP中，$_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，通常可以通过VB代码中的数组语法（例如$_POST['bookings']），但访问它，您可以实际上将JSON字符串作为POST正文发布。

在PHP中，您可以像这样访问原始POST主体：

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

其余代码应该照常工作。

编辑：实际上，你也有错字。尝试

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

Answer 2

还有一个json数组。试试这个。

<?php
$data='{"key":"91a1522Test",
 "bookings":
   {"booking":[{"ClassId":"4",  "ClassName":"THOASC",   "YearWeek":"1751"}]} }';
$data = json_decode($data,true);
echo '<pre>';
print_r($data);
$total = count($data['bookings']['booking']);
echo $total;

Answer 3

$ data = json_decode（$ bookings， true ）;

这里根据php文档，json_decode函数中的sencond参数表示返回输出为对象还是数组

参数2 = true （将返回数组）

参数2 = false （将返回对象，它是默认值）

json_decode生成以下数组

Array
(
    [key] => 91a1522Test
    [bookings] => Array
        (
            [booking] => Array
                (
                    [0] => Array
                        (
                            [ClassId] => 4
                            [ClassName] => THOASC
                            [YearWeek] => 1751
                        )

                )

        )

)

因此，应该像计数一样访问（$ data [＆＃39;预订＆＃39;] [＆＃39;预订＆＃39;]）

Answer 4

如果我看到正确，你的根目录"key"和"bookings"对象，"bookings"对象里面有"booking"数组。因此，访问大小的正确方法应该是

count($data['bookings']['booking']);

无法json_decode

4 个答案: