Getting the name of a stdClass object in PHP

Question

I'm playing with an API that's giving me data back in JSON format that I then json_decode() to the following format:

[stockData] => stdClass Object ( [data] => stdClass Object ( [PS3] => stdClass Object ( [2015-01-26T20:45:01Z] => stdClass Object ( [AMU] => 999.76 [ZIT] => 3.63 ) ) ) [status] => stdClass Object ( [code] => 200 [text] => ok ) )

I need some way of getting the 2015-01-26T20:45:01Z (which changes all the time).

I've tried get_Class() on the object, eg:

get_Class($bawsaq->stockData->data->PS3) (actually in a foreach loop)

But all that's returned is: "stdClass" and not the name. How can I get the object's name?

Why don't use the second argument to json_decode() so it returns arrays instead of objects? — Barmar
– Barmar, Commented Jan 26, 2015 at 21:36
2015-01-26T20:45:01Z isn't the class name, it's a property name. — Barmar
– Barmar, Commented Jan 26, 2015 at 21:37

lonesomeday · Accepted Answer · 2015-01-26 21:39:08Z

It isn't actually the object's class: it's the name of the property that contains the stdClass object. So you'd need to get the first object property name from $bawsaq->stockData->data->PS3. Which is a bit tricky, actually.

It's nicer to work with arrays. If you use the $assoc parameter of json_decode, you can get an associative array instead of an object whenever a JSON object appears. This is much easier to deal with in PHP.

$bawsaq = json_decode($jsonData, true);

You can get the key name with key:

$dateTime = key($bawsaq['stockData']['data']['PS3']);

Wonderful. I like dealing with objects normally, but clearly arrays are nicer in times like this. Thanks!
Generally I'll work in objects too, but almost never with stdClass ones. Glass to help.

Barmar · Accepted Answer · 2015-01-26 21:39:07Z

When you decode the JSON, use

$bawsaq = json_decode($json, true);

This will return associative arrays instead of stdClass objects for all the JSON objects. Then you can use

$keys = array_keys($bawsaq['stockData']['data']; $date = $keys[0];

Piotr Olaszewski · Accepted Answer · 2015-01-26 21:38:14Z

You can use get_object_vars method.

$obj = new stdClass(); $obj->field1 = 'value1'; print_r(get_object_vars($obj));

Result:

Array ( [field1] => value1 )

Sebb · Accepted Answer · 2015-01-26 21:40:34Z

You can use the second argument to json_decode. This will return the data as an associative array instead of an object list, so you could simply use

$input = json_decode($jsonInput, true); $key = key($input['stockData']['data']['PS3']); $data = $input['stockData']['data']['PS3'][$key];

or a foreach-loop. See also key on php.net.

That wont work it would jsut make the reference look like: $input['stockData']['data']['PS3']['2015-01-26T20:45:01Z']

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