Php Json数组，从每个数组键获取第一个值

我试图做的是获取每个数组键，然后将第一个“价格”和“数量”与每个数组键相关联。 我的阵列：

{
  "32557580": {
    "bids": [
      {
        "price": 2500,
        "quantity": 38265661
      },
      {
        "price": 2439,
        "quantity": 57414444
      },
      {
        "price": 2381,
        "quantity": 1092179
      },
      {
        "price": 2174,
        "quantity": 27140648
      }
    ],
    "offers": [
      {
        "price": 2564,
        "quantity": 33634591
      },
      {
        "price": 2597,
        "quantity": 27842125
      },
      {
        "price": 2632,
        "quantity": 925092
      },
      {
        "price": 2667,
        "quantity": 3565173
      },
      {
        "price": 2778,
        "quantity": 27589980
      }
    ]
  },
  "32557581": {
    "bids": [
      {
        "price": 4854,
        "quantity": 33786947
      },
      {
        "price": 4808,
        "quantity": 22881344
      },
      {
        "price": 4762,
        "quantity": 2513747
      },
      {
        "price": 4717,
        "quantity": 2650000
      },
      {
        "price": 4587,
        "quantity": 15714786
      }
    ],
    "offers": [
      {
        "price": 4950,
        "quantity": 31749492
      },
      {
        "price": 5000,
        "quantity": 3193999
      },
      {
        "price": 5051,
        "quantity": 2292463
      },
      {
        "price": 5102,
        "quantity": 34770816
      },
      {
        "price": 5128,
        "quantity": 2605693
      }
    ]
  },
  "32557582": {
    "bids": [
      {
        "price": 2532,
        "quantity": 60354703
      },
      {
        "price": 2500,
        "quantity": 113667648
      },
      {
        "price": 2439,
        "quantity": 5125100
      },
      {
        "price": 2222,
        "quantity": 120803051
      }
    ],
    "offers": [
      {
        "price": 2564,
        "quantity": 1492990
      },
      {
        "price": 2597,
        "quantity": 22121811
      },
      {
        "price": 2632,
        "quantity": 42119270
      },
      {
        "price": 2667,
        "quantity": 43680406
      },
      {
        "price": 2703,
        "quantity": 1176966
      }
    ]
  }
}

例如：

Id: 32557580
Price: 2500
Quantity: 38265661
Id: 32557581
Price: 4854
Quantity: 33786947

等等

这就是我目前得到的

$obj = json_decode($result,true);
$all_keys = array_keys($obj);
foreach ($all_keys as $key => $value) {
    echo 'Id: '.$value.'<br>';
}

我真的不确定从这里走到哪里，我试着看了很多问题和答案。 我尝试在我得到的一个foreach中添加另一个foreach，但我只从第一个数组键获得了价格和数量

---

非常感谢所有帮助我走上正轨的人

只需循环主数组，并从

bids

获取第一个数组，然后使用该数组：

foreach($obj as $key => $value) {
    $first = reset($value['bids']);
    echo "ID: $key<br />";
    echo "Price: " . $first['price'] . "<br />";
    echo "Quantity: " . $first['quantity'] . "<br />";
}

---

只需循环主数组，从

bids

获取第一个数组，然后使用该数组：

foreach($obj as $key => $value) {
    $first = reset($value['bids']);
    echo "ID: $key<br />";
    echo "Price: " . $first['price'] . "<br />";
    echo "Quantity: " . $first['quantity'] . "<br />";
}

---

哦这是有道理的。谢谢。：）哦这是有道理的。谢谢。：）

foreach($obj as $key => $value) {
    echo "ID: $key<br />";
    echo "Price: " . $value['bids'][0]['price'] . "<br />";
    echo "Quantity: " . $value['bids'][0]['quantity'] . "<br />";
}