Json array, get first value from each array key - php

Question

What i'm trying to do is get the each array key and then associate the first "price" and "quantity" with each array key.
My array:
{
"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
}
]
}
}
Example:
Id: 32557580
Price: 2500
Quantity: 38265661
Id: 32557581
Price: 4854
Quantity: 33786947
etc..
This is what i got so far
$obj = json_decode($result,true);
$all_keys = array_keys($obj);
foreach ($all_keys as $key => $value) {
echo 'Id: '.$value.'<br>';
}
Output from this is:
Id: 32557580
Id: 32557581
Id: 32557582
I'm not really sure where to go from here, i have tried look at multiple questions and answers elswere.
I tried adding another foreach inside the one i got but i only got the price and quantity from the first array key.
All help with getting me on the right track is appreciated.

Answer 1

Just loop the main array and get the first from bids and use that:
foreach($obj as $key => $value) {
$first = reset($value['bids']);
echo "ID: $key<br />";
echo "Price: " . $first['price'] . "<br />";
echo "Quantity: " . $first['quantity'] . "<br />";
}
Or use the index, which in this case is 0 but may not always be depending on the JSON:
foreach($obj as $key => $value) {
echo "ID: $key<br />";
echo "Price: " . $value['bids'][0]['price'] . "<br />";
echo "Quantity: " . $value['bids'][0]['quantity'] . "<br />";
}