eZ\Publish\Core\Persistence\Legacy\Content\FieldValue\Converter\PageConverter::restoreValueFromXmlString PHP Method

    public function restoreValueFromXmlString($xmlString)
    {
        $zones = array();
        $attributes = array();
        $layout = null;
        if ($xmlString) {
            $dom = new DOMDocument('1.0', 'utf-8');
            $dom->loadXML($xmlString);
            $root = $dom->documentElement;
            foreach ($root->childNodes as $node) {
                if ($node->nodeType !== XML_ELEMENT_NODE) {
                    continue;
                }
                switch ($node->nodeName) {
                    case 'zone':
                        $zone = $this->restoreZoneFromXml($node);
                        $zones[] = $zone;
                        break;
                    case 'zone_layout':
                        $layout = $node->nodeValue;
                        break;
                    default:
                        $attributes[$node->nodeName] = $node->nodeValue;
                        break;
                }
            }
            if ($root->hasAttributes()) {
                foreach ($root->attributes as $attr) {
                    $attributes[$attr->name] = $attr->value;
                }
            }
        }
        return new Parts\Page(array('zones' => $zones, 'layout' => $layout, 'attributes' => $attributes));
    }

    /**
     * Test converting from XML to storage and back.
     */
    public function testFromStorageAndBack()
    {
        $xml = <<<EOF
<?xml version="1.0"?>
<page>
  <zone id="id_ee94402090bb170600a8dab9e1bd1c5a">
    <block id="id_ef9fee870c65c676b2f7136431b73f37">
      <name>My Block</name>
      <type>my_block_type</type>
      <view>default</view>
      <overflow_id></overflow_id>
      <custom_attributes>
        <copytext></copytext>
      </custom_attributes>
      <rotation>
        <interval>0</interval>
        <type>0</type>
        <value></value>
        <unit></unit>
      </rotation>
      <zone_id>ee94402090bb170600a8dab9e1bd1c5a</zone_id>
    </block>
    <zone_identifier>zone_1</zone_identifier>
  </zone>
  <zone_layout>my_zone_layout</zone_layout>
</page>

EOF;
        $page = $this->converter->restoreValueFromXmlString($xml);
        $newXml = $this->converter->generateXmlString($page);
        $this->assertEquals($xml, $newXml);
    }