SerializationTestEncoder.php

<?php

namespace Drupal\serialization_test;

use Symfony\Component\Serializer\Encoder\EncoderInterface;
class SerializationTestEncoder implements EncoderInterface {
    
    /**
     * The format that this Encoder supports.
     *
     * @var string
     */
    protected static $format = 'serialization_test';
    
    /**
     * {@inheritdoc}
     */
    public function encode($data, $format, array $context = []) {
        // @see \Drupal\serialization_test\SerializationTestNormalizer::normalize().
        return 'Normalized by ' . $data['normalized_by'] . ', Encoded by SerializationTestEncoder';
    }
    
    /**
     * {@inheritdoc}
     */
    public function supportsEncoding($format) {
        return static::$format === $format;
    }

}