<?php

use Zend\Xml2Json\Xml2Json;
use Zend\Debug\Debug;

$xmlStr = file_get_contents(__DIR__ . '/city.xml');

$json = Xml2Json::fromXml($xmlStr);

echo Debug::dump($xmlStr, null, false);
echo $json;

string(296) "<?xml version="1.0" encoding="UTF-8"?>

<List>

    <City>

        <CityId>1</CityId>

        <Name>South Park</Name>

    </City>

    <City>

        <CityId>2</CityId>

        <Name>Springfield</Name>

    </City>

    <City>

        <CityId>3</CityId>

        <Name>Quahog</Name>

    </City>

</List>"

{"List":{"City":[{"CityId":"1","Name":"South Park"},{"CityId":"2","Name":"Springfield"},{"CityId":"3","Name":"Quahog"}]}}

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PHP 7.2, Zend 3.0, Symfony 4.0, Laravel 5.6, PHPUnit 6.5, Doctrine 2.8