chill-bundles/src/Bundle/ChillDocGeneratorBundle/Serializer/Helper/NormalizeNullValueHelper.php

<?php

namespace Chill\DocGeneratorBundle\Serializer\Helper;

use Symfony\Component\Serializer\Normalizer\NormalizerInterface;

class NormalizeNullValueHelper
{
    private NormalizerInterface $normalizer;

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

    public function normalize(array $attributes, string $format = 'docgen', ?array $context = [])
    {
        $data = [];

        foreach ($attributes as $key => $class) {
            if (is_numeric($key)) {
                $data[$class] = '';
            } else {
                switch ($class) {
                    case 'array':
                    case 'bool':
                    case 'double':
                    case 'float':
                    case 'int':
                    case 'resource':
                    case 'string':
                    case 'null':
                        $data[$key] = '';
                        break;
                    default:
                        $data[$key] = $this->normalizer->normalize(null, $format, \array_merge(
                            $context,
                            ['docgen:expects' => $class]
                        ));
                        break;
                }
            }
        }

        return $data;
    }
}