如何使用数组索引访问 php 中的 Json 信息

Question

I want to get all prices and add them. I was planning on using this to loop through the JSON but that would be another question. Am I approaching this the wrong way? Is there a better way to get the SUM of all prices?

I have found this answer which makes the same question but it does not work (duplicate: PHP: How to access array element values using array-index ). Here is my JSON string.

{
  "data": {
    "230723": {
      "2019-11-15": {
        "price": 52,
        "min_length_of_stay": 2,
        "available": 1
      },
      "2019-11-16": {
        "price": 90,
        "min_length_of_stay": 2,
        "available": 0
      },
      "2019-11-17": {
        "price": 44,
        "min_length_of_stay": 2,
        "available": 0
      },
      "2019-11-18": {
        "price": 44,
        "min_length_of_stay": 2,
        "available": 0
      }
    }
  }
}

And here is my code:

$resultJson =  file_get_contents('http://....');

$priceRange = json_decode($resultJson, true);
echo $priceRange['data']['230723']['2019-11-15']['price'];  // working

//$priceRange = array_values($priceRange);
echo $priceRange[0][0][0][0]; // not working

The first echo works and return 52. The second echo does not work with or without the commented line (which was the answer to the duplicate question).

What am I missing?

Answer 1

Well you know I hope that the data is in data and if you don't know the next key then reset helps. Then just get all price keys (hopefully you know this as well) and sum them:

$result = array_sum(array_column(reset($array['data']), 'price'));

Another way is using array_values on the first two levels:

$result = array_sum(array_column(array_values(array_values($array)[0])[0], 'price'));

To get each price the way you were trying to do you would need:

$result = array_values(array_values(array_values(array_values($array)[0])[0])[0])[0];

Answer 2

Instead of changing the array from associative to numeric just loop through already existing array

Like this

$sum = 0;
$resultJson =  file_get_contents('http://....');

$priceRanges = json_decode($resultJson, true);
foreach ($priceRanges['data'] as $id => $priceRange) {
    if (!is_array($priceRange)) {
        continue;
    }
    foreach ($priceRange as $date => $priceInfo) {
        $sum += (isset($priceInfo['price']) ? intval($priceInfo['price']) : 0);
    }
}

Answer 3

The code I wrote using Krzysztof Janiszewski answer, and works.

$sum = 0;

$priceRange = json_decode($resultJson, true);

foreach($priceRange as $item) {
    foreach($item as $item2){
        foreach($item2 as $item3){
            $sum += $item3['price'];    
        }
    }
}

echo $sum;