从php中获取json数组的数据。

I am having trouble accessing information in a json-Array that I retrieved using php's json_decode function.

我在使用php的json_decode函数检索的json数组中访问信息时遇到了麻烦。

the json-file looks as follows:

json文件如下:

{"code":0,"message":"Okay","model":{"results":[{"message":"Okay","balance":0,"openPositions":[[],[]],"firstDepositDate":XXX,"currencySign":"€","email":"X.X@X.com","code":0}]},"result":"success"}

I used the following php code to get the contents:

我使用以下php代码获取内容:

$json = file_get_contents($json_url);
$data = json_decode($json,true);
echo '<pre>' . print_r($json, true) . '</pre>';

The result print_r displays looks just like what I expect and looks like the json.

结果print_r显示的结果与我预期的一样，看起来像json。

However, I cannot figure out to access the variables. Whenever I try something like

但是，我无法找到访问变量的方法。每当我尝试类似的东西

$test = $json['model']['results']['balance'];

the script throws an error, which I can't identify. I already figured out if I access the $json variable like so:

脚本抛出一个错误，我无法识别。我已经知道如果我访问$json变量，比如:

$test = $json[n]; // returns the nth character, e.g. n = 0 $test = "{", n = 2 $test = "c"

The script also did not throw an error if I tried accessing the variable like so:

如果我尝试像这样访问变量，脚本也不会抛出错误:

$test = $json['code']; // returns "{"

Can someone help me figure out how to navigate this array?

有人能帮我找到如何导航这个数组吗?

Thanks!

谢谢!

3 个解决方案

#1

The results key is a true array, not an unordered map (key/value). Additionally, you should be accessing the decoded $data, not the $json string.

结果键是一个真实的数组，而不是无序映射(键/值)。此外，您应该访问解码后的$数据，而不是$json字符串。

This should work for you:

这应该对你有用:

$test = $data['model']['results'][0]['balance'];

This is what should have tipped you off:

这就是应该告诉你的:

{"results":[{"message"
^          ^
|          |
|          \-- Start of an array
|
\-- Start of an object

#2

You recieve an error similar to Cannot use object of type stdClass as array in (...) right?

您收到一个类似于无法在(…)中使用类型为stdClass的对象作为数组的错误，对吗?

json_decode returns an object of the type stdClass which is the only object in php (as far as I know) which properties cannot be accessed like an array. You will have to access them as follows:

json_decode返回一个stdClass类型的对象，stdClass是php中惟一的对象(据我所知)，它的属性不能像数组那样被访问。您将必须访问它们如下:

$json = '{"code":0,"message":"Okay","model":{"results":[{"message":"Okay","balance":0,"openPositions":[[],[]],"firstDepositDate":"XX","currencySign":"€","email":"X.X@X.com","code":0}]},"result":"success"}';
$obj = json_decode($json);
var_dump($obj->message); //works
var_dump($obj["message"]); //throws exception

#3

There is an error in the JSON array. "firstDepositDate": XXX is not a valid value. Should be a string "XXX".

JSON数组中有一个错误。“firstDepositDate”:XXX不是一个有效值。应该是字符串“XXX”。

Also you are trying to the wrong variable. The decoded data should be a PHP array. In this case $data['code'] instead of $json['code']

你也在尝试错误的变量。解码后的数据应该是一个PHP数组。在这种情况下，$data['code']而不是$json['code']

#1