Controller example

ExportController.php

<?php

namespace Ez\ExampleBundle\Controller;

use eZ\Bundle\EzPublishCoreBundle\Controller;
use Symfony\Component\Serializer\Encoder\XmlEncoder;
use Symfony\Component\Serializer\Serializer;

class ExportController extends Controller
{
    public function exampleAction( $contentId )
    {
        $serializer = new Serializer(array(),array( 'xml' => new XmlEncoder()));

        // language is optional
        $language = array( "fre-FR" );

        $contentVersion = $this->getRepository()->getContentService()->loadContent( $contentId, $language );
        $fields = $contentVersion->getFields();
        $contentType = $this->getRepository()->getContentTypeService()->loadContentType(
            $contentVersion->getVersionInfo()->getContentInfo()->contentTypeId
        );

        // Transform to array ( fieldDef => value)
        $fieldsList = array();
        foreach( $fields as $field )
        {
            $fieldsList[ $field->fieldDefIdentifier ] = $field->value;
        }

        $finalResult = array();
        foreach( $contentType->fieldDefinitions as $fieldDefinition )
        {
            $fieldTypeIdentifier = $fieldDefinition->fieldTypeIdentifier;
            if ( $fieldTypeIdentifier == "ezxmltext" )
            {
                // We transform xml to html with html5 converter
                $htmlConverter = $this->container->get('ezpublish.fieldType.ezxmltext.converter.html5');
                $value = $htmlConverter->convert( $fieldsList[$fieldDefinition->identifier]->xml );
            }
            else
            {
                $value = $fieldsList[$fieldDefinition->identifier];
            }

            $finalResult[] = array( "identifier" => $fieldTypeIdentifier, "value" => $value );


            echo "<hr />";
        }
        var_dump($finalResult);
        die();
    }
}