PHP Soap Client收到不完整的数据

I wrote very simple code to retrieve soap data:

    $wsdl = 'https://...';
    $client = new SoapClient($wsdl, ['trace' => true]);

    $soap_parameters = [
        'leveranciernaam' => 'xxx',
        'leveranciersleutel' => 'yyy',
        'brinnummer' => 'zzzz',
        'schooljaar' => 2012
    ];

    $response = $client->getLeerlingen($soap_parameters);

To my huge surprise, the return was different from the return i received while using a Java based GUI application. Some fields in PHP SoapClient's response were consistently missing.

Just to make sure that things were not lost in translation to stdObjects, I used trace option to and extracted actual XMl from $client->__getLastResponse(); Still those fields were not there - very consistently over hundreds of records.

Windows Java based client's response:

<return>
    <leerlingen>
        <leerling>
            <id>353226866</id>
            <roepnaam>Evline</roepnaam>
            ...  
            <achternaam>Staalstra</achternaam>
            <inschrijvingen>
                <inschrijving>
                    <id>353226867</id>
                    <datumInschrijving>2007-08-20T00:00:00+02:00</datumInschrijving>
                    <schoolVanHerkomst>7138</schoolVanHerkomst>
                    <vervolgSchool>7138</vervolgSchool>
                    <onderwijsSoortBestemming>
                       <id>4085</id>
                   </onderwijsSoortBestemming>
                </inschrijving>
            </inschrijvingen>
        </leerling>
        ...
    </leerlingen>
    <brins>
        <brin>
            <id>47187537</id>
            <brinNummer>02YN02</brinNummer>
            <schoolNaam>De Ambelt School V LZK</schoolNaam>
        </brin>
        ...
    </brins>
</return>

Response i get:

<return>
    <leerlingen>
        <leerling>
            <id>353226866</id>
            <roepnaam>Evline</roepnaam>
            ...  
            <achternaam>Staalstra</achternaam>
            <inschrijvingen>
                <inschrijving>
                    <id>353226867</id>
                    <datumInschrijving>2007-08-20T00:00:00+02:00</datumInschrijving>
                    <inschrijvingType>1766564</inschrijvingType>
                </inschrijving>
            </inschrijvingen>
        </leerling>
        ...
    </leerlingen>
</return>

PHP client does not get (or does not properly parse) any elements schoolVanHerkomst, vervolgSchool and onderwijsSoortBestemming in element inschrijving and it misses brins completely.

For brevity, I omitted other deeply nested elements that work just fine

Because expected results are dynamic, WDSL ( https://acceptatie.parnassys.net/bao/services/cxf/v1/generic?wsdl ) does not define ouput.

What is going on? It seems that PHP Soap client is less reliable than Java Soap clients