無法json_decode

Question

我將數據從Vb.net客戶端發布到PHP rest api但由於某種原因json_decode不能處理傳遞的字符串。 發布到服務器的代碼是：

        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()

正在傳遞的值：

{"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應該顯示1，因為預訂數組中有1個項目，但總是顯示0

Answer 1

$_POST->bookings - 這是你的問題。 ->是對象訪問運算符，但在PHP中， $_POST不是對象而是數組。

如果您將此值作為表單數據的一部分提交，您通常會通過數組語法訪問它（例如$_POST['bookings'] ）， 但是從VB代碼中，您實際上是將JSON字符串作為POST主體本身發布。

在PHP中，您可以像這樣訪問原始POST主體：

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

然后你的其余代碼應該像往常一樣工作。

編輯：實際上，你也有一個錯字。 嘗試

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

Answer 2

那里還有一個json數組。 嘗試這個。

<?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 ）;

這里根據php文檔，json_decode函數中的sencond參數表示返回輸出是作為對象還是作為數組

參數2 = true （將返回數組 ）

參數2 = false （將返回對象 ，它是默認值）

json_decode生成以下數組

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

                )

        )

)

因此應該像count一樣訪問它（$ data ['bookings'] ['booking']）

Answer 4

如果我沒有看到它，你有"key"和"bookings"在根和內部對象"bookings"的對象是"booking"陣列。 因此，訪問大小的正確方法應該是

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