Base64使用json_decode在php中解码

Question

您好我有以下问题，在某些情况下，json_decode不起作用，我得到一个空数组如下。

// for test purpose set the inbound enc parameter
$_POST["enc"] = "eyJ0cmFuc2NyaXB0IjoiLSAgICAgICAgICBQYXN0ZWQgdGhlIHRleHQgaW50byBOb3RlcGFkIBMgbm8gc3BlY2lhbCBjaGFyYWN0ZXJzIiwiaWQiOjcwLCJpc0FjdGlvbmVkIjp0cnVlLCJ1c2VyX2lkIjoxLCJ0YXNrX3R5cGVfaWQiOjEsImFjY291bnRfaWQiOjIxLCJhY2NvdW50X25hbWUiOiJURVNUIiwiZXZlbnRfZGF0ZSI6bnVsbH0=";

$decoded = base64_decode($_POST["enc"]);
$ar = (array)json_decode($decoded);

echo "<pre>";
    print_r($decoded);
echo "</pre>";

echo "<pre>";
    print_r($ar);
echo "</pre>";

$decoded显示为json字符串，但$ar为null。

任何帮助，请帮助我解决这个问题。

Answer 1

错误发生在JSON - 奇怪的是在“记事本”和“否”之间的两个空格中。

看起来空格之间存在非标准字符。删除该字符，JSON有效。

<强>无效

{"transcript":"- Pasted the text into Notepad  no special characters","id":70,"isActioned":true,"user_id":1,"task_type_id":1,"account_id":21,"account_name":"TEST","event_date":null}

<强>有效

{"transcript":"- Pasted the text into Notepad  no special characters","id":70,"isActioned":true,"user_id":1,"task_type_id":1,"account_id":21,"account_name":"TEST","event_date":null}

将来，理想情况下，您可以使用json_encode来构建JSON字符串。该函数将自动为您转义任何无效字符。

Answer 2

您没有在json_decode中提供第二个参数作为数组返回，而不是对象

// for test purpose set the inbound enc parameter
$_POST["enc"] = "eyJ0cmFuc2NyaXB0IjoiLSAgICAgICAgICBQYXN0ZWQgdGhlIHRleHQgaW50byBOb3RlcGFkIBMgbm8gc3BlY2lhbCBjaGFyYWN0ZXJzIiwiaWQiOjcwLCJpc0FjdGlvbmVkIjp0cnVlLCJ1c2VyX2lkIjoxLCJ0YXNrX3R5cGVfaWQiOjEsImFjY291bnRfaWQiOjIxLCJhY2NvdW50X25hbWUiOiJURVNUIiwiZXZlbnRfZGF0ZSI6bnVsbH0=";

$decoded = base64_decode($_POST["enc"]);
$ar = json_decode($decoded, true); //<-- Now returned as an array, and not an object

echo "<pre>";
    print_r($decoded);
echo "</pre>";

echo "<pre>";
    print_r($ar);
echo "</pre>";   

<强>输出

{"transcript":"-          Pasted the text into Notepad  no special characters","id":70,"isActioned":true,"user_id":1,"task_type_id":1,"account_id":21,"account_name":"TEST","event_date":null}

Answer 3

使用您的代码并解码Base64编码的字符串后，您的JSON数据中有一个CHR(13) ASCII字符，导致JSON根据JSON Lint验证失败。取出该字符会导致JSON正确解析。

PHP Fiddle

解码的JSON数据：

{
    "transcript": "-          Pasted the text into Notepad  no special characters",
    "id": 70,
    "isActioned": true,
    "user_id": 1,
    "task_type_id": 1,
    "account_id": 21,
    "account_name": "TEST",
    "event_date": null
}

HEX Editor截图：