<?php

use JMS\Serializer\SerializerBuilder;
use JMS\Serializer\Annotation as A;

// for annotations see
// http://jmsyst.com/libs/serializer/master/reference/annotations

/**
 * A\ExclusionPolicy("all")
 * @A\XmlRoot("data")
 */
class Data
{
    /**
     * @A\Type("integer")
     */
    private $id;
    
    /**
     * @A\Type("string")
     */
    private $name;
    
    /**
     * @A\XmlKeyValuePairs
     * @A\Type("array<string, string>")
     */
    private $values = [];
    
    /**
     * @A\Type("integer")
     */
    private $null = null;
}

$serializedXml = '<?xml version="1.0" encoding="UTF-8"?>
<data>
    <id>1</id>
    <name><![CDATA[John Doe]]></name>
    <values>
        <entry><![CDATA[32]]></entry>
        <entry><![CDATA[brown]]></entry>
    </values>
</data>';

$serializer = (new SerializerBuilder())
    ->build();

$data = $serializer->deserialize(
    $serializedXml,
    Data::CLASS,
    'xml'
);

var_dump($data);

object(Data)#1557 (4) { ["id":"Data":private]=> int(1) ["name":"Data":private]=> string(8) "John Doe" ["values":"Data":private]=> array(1) { ["entry"]=> string(5) "brown" } ["null":"Data":private]=> NULL }

• Serialization to XML with JMS Serializer
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PHP 7.3, Zend 3.0, Symfony 4.3, Laravel 5.8, PHPUnit 8.0, Doctrine 2.10