How to take a value from nested array(json format) without using multiple foreach in php

Question

I want to take the all id values in the json format.

{
"1": {
  "name": "test",
  "followup": {
    "1": {
       "id": "98",
       "followup": {
          "1": {
           "id": "93",
           "followup": {
            "1": {
             "id": "174"
            },
          }
        }
       }
     }
  }
 }
}

I can achieve this by using nested foreach. But now the 'followup' key is present in 3 but it may came 6,7 so we can't add 6,7 foreach.

You need to get the followup id? what must be the desired output of your example? — Luis felipe De jesus Munoz
– Luis felipe De jesus Munoz, Commented Apr 4, 2018 at 14:14
you need to loop through it if you want to access that keys. I think you should try to simplify your json object, so it wouldn't be so nested — devnull Ψ
– devnull Ψ, Commented Apr 4, 2018 at 14:18

mega6382 · Accepted Answer · 2018-04-04 14:19:02Z

4

You can use the array_walk_recursive() for this, like(DEMO):

$ids = array();
$data = json_decode($str, true);

array_walk_recursive($data, function($v, $k) use (&$ids) {
    if ($k === 'id') {
        $ids[] = $v;
    }
}); 

var_dump($ids);

This basically goes through every index 1 at a time and matches the the keys against the key id, and if it matches it captures the value.

answered Apr 4, 2018 at 14:19

mega6382

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