如何从json对象获取值到php数组

Question

I am writing a php file for an application that allows the user to print a project report (with fpdf library).

The aim is to get datas from a db and then to build the PDF file dynamically.

The datas are stored in json.

It is ok for almost all datas, but there are some that I can't reach. Here is an example : First of all I already did this :

$Array['roof_coordinates'] = json_decode($Array['roof_coordinates'], false);

To get the number "nb" of "A523500" I'm doing like that :

$Array['roof_coordinates']->results->packingList->total->A523500->nb;

What am I doing wrong ?

  "roofCoordinates": {

    "results": {

      "packingList": {

        "total": {

          "A523500": {

            "ref": "STRA523500",
            "nb": 16

          },
          "A523120": {

            "ref": "STRA523120",
            "nb": 0

          },
          "A522100": {

            "ref": "STRA522100",
            "nb": 8

          },

        },

      }

    },

}

And I tried to pass "true" to json_decode to convert objects to associative array but it doesn't seems to work...

Any help will be great ! Thank you in advance ;)

Answer 1

Make sure you are accessing the resulting data structure correctly, it should work whether you decode to an array or an object.

<?php
$json = <<<END
{
  "roofCoordinates": {
    "results": {
      "packingList": {
        "total": {
          "A523500": {
            "ref": "STRA523500",
            "nb": 16
          },
          "A523120": {
            "ref": "STRA523120",
            "nb": 0
          },
          "A522100": {
            "ref": "STRA522100",
            "nb": 8
          }
        }
      }
    }
  }
}
END;

$arrayResults = json_decode($json, true);
$nbFromArray = $arrayResults['roofCoordinates']['results']['packingList']['total']['A523500']['nb'];

$stdClassResults = json_decode($json);
$nbFromStdClass =  $stdClassResults->roofCoordinates->results->packingList->total->A523500->nb;

assert($nbFromArray==16, 'Value should equal 16');
assert($nbFromArray==$nbFromStdClass, 'Values from either json_decode method should be equal');

echo 'From array: '.$nbFromArray.PHP_EOL;
echo 'From stdClass: '.$nbFromStdClass.PHP_EOL;