PHP7：SOAP中的问题

SOAP communication works in PHP5.6.26 but does not work in PHP7.0.13.

I started a project using php 5.6.26 and managed to communicate with the e-frete server via SOAP without problems.

This week I decided to update php to version 7.0.13, and communication via SOAP stopped working. I made several modifications based on examples on the internet, but nothing had any effect.

The code down, works 100% in php 5.6.26 but not in php 7.0.13:

$obterOperacaoTransportePdf = [
    'ObterOperacaoTransportePdfRequest' => [
        'Integrador' => 'xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx', //Hash de referência ao integrador
        'Versao' => '1', //Versão = 1
        'CodigoIdentificacaoOperacao' => 'xxxxxxxxxx/aaaa', //Código de identificação da Operação (CIOT).
        'DocumentoViagem' => ''
    ]
]; 

$options = array(
    'local_cert' => $this->certKEY,
    'soap_version' => SOAP_1_2,
    'cache_wsdl' => WSDL_CACHE_NONE,
    "style" => SOAP_RPC,
    'connection_timeout' => 15,
    'encoding' => 'UTF-8',
    'trace' => 1,
    'exceptions' => 1
);

$urlWsdl = 'https://sistema.efrete.com:6061/Services/PefService.asmx?wsdl';
$soap = new \SoapClient($urlWsdl, $options);
$data = $soap->ObterOperacaoTransportePdf($obterOperacaoTransportePdf);

I have debugged the function "__doRequest" and value of the variable "$request" is: (Below, php 5.6.26 - correct and functional.)

<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope"      xmlns:ns1="http://schemas.ipc.adm.br/efrete/objects" xmlns:ns2="http://schemas.ipc.adm.br/efrete/pef/objects" xmlns:ns3="http://schemas.ipc.adm.br/efrete/pef">
<env:Body>
    <ns3:ObterOperacaoTransportePdf>
        <ns2:ObterOperacaoTransportePdfRequest>
            <ns1:Integrador>xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx</ns1:Integrador>
            <ns1:Versao>1</ns1:Versao>
            <ns2:CodigoIdentificacaoOperacao>xxxxxxxxxx/aaaa</ns2:CodigoIdentificacaoOperacao>
        </ns2:ObterOperacaoTransportePdfRequest>
    </ns3:ObterOperacaoTransportePdf>
</env:Body>
</env:Envelope>

The value of the "$ request" variable of php 7.0.13 is: (Is not correct.)

<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://www.w3.org/2003/05/soap-envelope" xmlns:ns1="http://schemas.ipc.adm.br/efrete/pef/objects" xmlns:ns2="http://schemas.ipc.adm.br/efrete/pef">
<env:Body>
    <ns2:ObterOperacaoTransportePdf>
        <ns1:ObterOperacaoTransportePdfRequest/>
    </ns2:ObterOperacaoTransportePdf>
</env:Body>
</env:Envelope>

Anyone know a way to workaround this PHP7 issue?

Thank you very much!