PHP Symfony parse JSON response deserialize class constructor

Question

I am trying to parse this JSON $response body = {"low":{"networkFee":"0.00003"},"medium":{"networkFee":"0.0000428"},"high":{"networkFee":"0.00024"}}

my code:

class Low {
  private $networkFee;
}
class Medium {
  private $networkFee;
}
class High {
  private $networkFee;
}
class FeeClass{ 
  public function __construct(Low $low, Medium $medium, High $high) {
    $this->low = $low;
    $this->medium = $medium;
    $this->high = $high;
  }
}
$encoders = [new JsonEncoder()];
$normalizers = [new ObjectNormalizer()];
$serializer = new Serializer( $normalizers, $encoders );

$parsed = $serializer->deserialize((string)$response->getBody(), FeeClass::class, 'json');

var_dump("parsed:", $parsed);//I only get 3 NULL in $parsed

My dependencies:

"laravel/framework": "6.20.x",
"symfony/serializer": "5.1.x",

@aynber If you bypass the framework functionality you are forced to implement annoying manual checks (e.g. detect invalid JSON) and it's harder to get proper integration (how do you report errors?). — Álvaro González
– Álvaro González, Commented Feb 10 at 8:19

Olivier · Accepted Answer · 2025-02-06 16:48:34Z

A possibility is to make the $networkFee property public for Low, Medium and High:

require 'vendor/autoload.php';

use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
use Symfony\Component\Serializer\Serializer;

class Low {
  public $networkFee;
}

class Medium {
  public $networkFee;
}

class High {
  public $networkFee;
}

class FeeClass {
  private Low $low;
  private Medium $medium;
  private High $high;

  public function __construct(Low $low, Medium $medium, High $high) {
    $this->low = $low;
    $this->medium = $medium;
    $this->high = $high;
  }
}

$json = '{"low":{"networkFee":"0.00003"},"medium":{"networkFee":"0.0000428"},"high":{"networkFee":"0.00024"}}';

$encoders = [new JsonEncoder()];
$normalizers = [new ObjectNormalizer()];
$serializer = new Serializer( $normalizers, $encoders );
$parsed = $serializer->deserialize($json, FeeClass::class, 'json');
var_dump($parsed);

Output:

object(FeeClass)#31 (3) {
  ["low":"FeeClass":private]=>
  object(Low)#38 (1) {
    ["networkFee"]=>
    string(7) "0.00003"
  }
  ["medium":"FeeClass":private]=>
  object(Medium)#33 (1) {
    ["networkFee"]=>
    string(9) "0.0000428"
  }
  ["high":"FeeClass":private]=>
  object(High)#37 (1) {
    ["networkFee"]=>
    string(7) "0.00024"
  }
}

Alternatively you can add public constructors to Low, Medium and High:

class Low {
  private $networkFee;

  public function __construct($networkFee) {
      $this->networkFee = $networkFee;
  }
}

class Medium {
  private $networkFee;

  public function __construct($networkFee) {
      $this->networkFee = $networkFee;
  }
}

class High {
  private $networkFee;

  public function __construct($networkFee) {
      $this->networkFee = $networkFee;
  }
}

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