PHP json_decode在解析JSON時顯示空

Question

我正在嘗試解析JSON數據，但是當json_decode() ， var_dump()將值顯示為null 。 下面是我的程序：

<?php

$json='_variable_1461092903017=[ {
    message:"success",
    data1:{
        datalist:[
                    {field1:"value1",field2:"value2"} ,
                    {field1:"value1",field2:"value2"} ,
                    {field1:"value1",field2:"value2"}
        ]
    },
    data2:[ {
        Date:"20 Apr 2016",
        details:[
                    {Code:"123",name:"xyz"},
                    {Code:"456",name:"abc"},
                ],
        }, 
        {
        Date:"21 Apr 2016",
        details:[
                    {Code:"123",name:"xyz"},
                    {Code:"456",name:"abc"},
                ],
        }, 
        {
        Date:"22 Apr 2016",
        details:[
                    {Code:"123",name:"xyz"},
                    {Code:"456",name:"abc"},
                ],
        }
    ]}
]';

$json_data = json_decode($json);
var_dump($json_data);

?>

Answer 1

就像其他人說的那樣，無效的JSON
您可以使用JSON Linter http://jsonlint.com對其進行調試

一個很酷的有效JSON鐵路圖：
http://www.json.org

這應該是您要尋找的（我沒有執行）：

<?php

$json='[{
    "message" :"success",
    "data1":{
        "datalist" :[
                    { "field1":"value1","field2":"value2"},
                    {"field1":"value1","field2":"value2"},
                    {"field1":"value1","field2":"value2"}
        ]
    },
    "data2":[ {
        "Date":"20 Apr 2016",
        "details":[
                    {"Code":"123","name":"xyz"},
                    {"Code":"456","name":"abc"}
                ]
        }, 
        {
        "Date":"21 Apr 2016",
        "details":[
                    {"Code":"123","name":"xyz"},
                    {"Code":"456","name":"abc"}
                ]
        }, 
        {
        "Date":"22 Apr 2016",
        "details":[
                    {"Code":"123","name":"xyz"},
                    {"Code":"456","name":"abc"}
                ]
        }
    ]}
]';

$json_data = json_decode($json);
var_dump($json_data);

JSON中的錯誤：

您需要雙引號您的密鑰：

{
    "key": "value"
}

不：

{
    key: "value"
}

在[ ]結束后，您要添加一個,

應該是這樣的：

{
    "datalist": [ "blah", "blah"]
}

不：

{
    "datalist": [ "blah", "blah"],
}

數組中的最后一個元素后面不應帶有逗號：

{
   "datalist": [{"key1":"value1", {"key2": "value2"}]
}

不：

{
   "datalist": [{"key1":"value1", {"key2": "value2"},]
}