How to output XML with JMSSerializer without header?

Question

PHP

Actually, the body itself is needed, without
<?xml version="1.0" encoding="UTF-8"?>
I do initialization like this.

$namingStrategy = new \JMS\Serializer\Naming\IdenticalPropertyNamingStrategy();
$annotationStrategy = new \JMS\Serializer\Naming\SerializedNameAnnotationStrategy($namingStrategy);
$serializer = \JMS\Serializer\SerializerBuilder::create()
  ->setPropertyNamingStrategy($annotationStrategy)
  ->build();

AnnotationRegistry::registerAutoloadNamespace('JMS\Serializer\Annotation', __DIR__ . '/../vendor/jms/serializer/src');

$serializedContent = \JMS\Serializer\SerializationContext::create();
$xml = $serializer->serialize($object, 'xml', $serializedContent);

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