Get key names from JSON array

Question

I need do extract all cpu ids from this kind of JSON response:

$response = json_decode('{
  "code": 26,
  "result": {
    "0": {
      "cpu": {
        "423": {
          "prod": "Intel",
          "model": "i5-8300H",
        },
        "424": {
          "prod": "Intel",
          "model": "i7-8750H",
        }
      }
    }
  }
}');

I managed to obtain first id 423 with this code:

$response = $response->result;
foreach ($response as $item) {
            $key = key((array)$item->cpu);
        }

but I can't find the way to get the reset, in this case 424. How can I do it?

Your $response assignment is not valid PHP syntax.

Barmar
– Barmar

2019-08-07 23:44:59 +00:00
Commented Aug 7, 2019 at 23:44 — Barmar
– Barmar, Commented Aug 7, 2019 at 23:44
Did you mean to write $response = json_decode('{...}');

Barmar
– Barmar

2019-08-07 23:46:21 +00:00
Commented Aug 7, 2019 at 23:46 — Barmar
– Barmar, Commented Aug 7, 2019 at 23:46
Use array_keys() instead of key();

msg
– msg

2019-08-07 23:47:35 +00:00
Commented Aug 7, 2019 at 23:47 — msg
– msg, Commented Aug 7, 2019 at 23:47
fixed the syntax

Dykow
– Dykow

2019-08-07 23:49:12 +00:00
Commented Aug 7, 2019 at 23:49 — Dykow
– Dykow, Commented Aug 7, 2019 at 23:49

Barmar · Accepted Answer · 2019-08-07 23:52:31Z

2

Since you didn't use the true second argument to json_decode(), all the elements are being parsed as objects, not arrays. Use json_decode(..., true) to get arrays.

Then you can use array_keys() to get all the keys of the cpu array.

$response = json_decode('
{
  "code": 26,
  "result": {
    "0": {
      "cpu": {
        "423": {
          "prod": "Intel",
          "model": "i5-8300H"
        },
        "424": {
          "prod": "Intel",
          "model": "i7-8750H"
        }
      }
    }
  }
}', true);
$response = $response['result'];
foreach ($response as $item) {
    $keys = array_keys($item['cpu']);
    var_dump($keys);
}

answered Aug 7, 2019 at 23:52

Barmar

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Comments

Nick · Accepted Answer · 2019-08-07 23:46:48Z

0

You just need to iterate over the cpu values as well; you can extract the key directly in the foreach:

$results = $response->result;
foreach ($results as $item) {
    foreach ($item->cpu as $key => $cpu) {
        echo "$key\n";
    }
}

Output:

423
424

Demo on 3v4l.org

answered Aug 7, 2019 at 23:46

Nick

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