Description:
------------
(sorry if duplicated)
Got an error when my SOAP class client return special characters.
When my data on database has no special chars everything is fine, but if I have some special chars "ç, ~" the bug happens.

Test script:
---------------
<?php
//WebserviceController.php
namespace Application\Controller;

use Zend\Mvc\Controller\AbstractActionController,
    Zend\View\Model\ViewModel,
    Zend\Soap\Client as SoapClient;

class WebserviceController extends AbstractActionController{
    private static $SERVIDOR = "192.168.1.103:8888"; //my server
    private $_WSDL_URI = "http://192.168.1.103:8888/WEB/GPA/public/webservice";
    
    public function autenticaAction(){
            $cliente = new SoapClient($this->_WSDL_URI.'/wsdl');
            $usuario = $cliente->autentica("jorgeley","123"); //my credentials on database
            return = new ViewModel(array('autentica' => $usuario));
    }

//my WSDL
   public function WsdlAction() {
        $wsdl = new AutoDiscover();
        $wsdl->setClass('\Application\Webservices\gpa')
            ->setUri($this->_WSDL_URI.'/soap');
        $wsdl->handle();
   }

//my SOAP
   public function soapAction(){
        $soap = new Soap(null, array('uri' => $this->_WSDL_URI."/wsdl", 'encoding' => 'UTF-8'));
        $soap->setClass('\Application\Webservices\gpa');
        $soap->handle();
    }
?>

<?php
//gpa.php
namespace Application\webservices;
use MyClasses\Conn\Conn,
    DoctrineModule\Authentication\Adapter\ObjectRepository,
    Zend\Authentication\AuthenticationService;

class gpa{
    public function autentica(string $login, string $senha){
        $adapter = new ObjectRepository();
        $auth = new AuthenticationService();
        $adapter->setOptions(array(
                                'object_manager' => Conn::getConn(), //my EntityManager
                                'identity_class' => 'MyClasses\Entities\AclUsuario',
                                'identity_property' => 'login',
                                'credential_property' => 'senha'
                                )
                            );
        $adapter->setIdentityValue($login);
        $adapter->setCredentialValue(sha1($senha));
        $resultado = $auth->authenticate($adapter);
        if ($resultado->isValid()){
            return array($resultado->getIdentity()->getId(), $resultado->getIdentity()->getNome());
        }else
            return array(0=>"login invalido");
    }
}
?>

Actual result:
--------------
An error occurred during execution; please try again later.
Informação adicional:
SoapFault

Arquivo:

    /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/Soap/Client.php:1118

Mensagem:

    SOAP-ERROR: Encoding: string 'adm \xe7...' is not a valid utf-8 string

Pilha de execução:

    #0 /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/Soap/Client.php(1118): SoapClient->__soapCall('autentica', Array, NULL, NULL, Array)
    #1 /mnt/sda3/PROJETOS/WEB/GPA/module/Application/src/Application/Controller/WebserviceController.php(62): Zend\Soap\Client->__call('autentica', Array)
    #2 /mnt/sda3/PROJETOS/WEB/GPA/module/Application/src/Application/Controller/WebserviceController.php(62): Zend\Soap\Client->autentica('jorgeley', '123')
    #3 /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/Mvc/Controller/AbstractActionController.php(83): Application\Controller\WebserviceController->autenticaAction()
    #4 [internal function]: Zend\Mvc\Controller\AbstractActionController->onDispatch(Object(Zend\Mvc\MvcEvent))
    #5 /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(468): call_user_func(Array, Object(Zend\Mvc\MvcEvent))
    #6 /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(207): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
    #7 /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/Mvc/Controller/AbstractController.php(116): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
    #8 /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/Mvc/DispatchListener.php(113): Zend\Mvc\Controller\AbstractController->dispatch(Object(Zend\Http\PhpEnvironment\Request), Object(Zend\Http\PhpEnvironment\Response))
    #9 [internal function]: Zend\Mvc\DispatchListener->onDispatch(Object(Zend\Mvc\MvcEvent))
    #10 /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(468): call_user_func(Array, Object(Zend\Mvc\MvcEvent))
    #11 /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(207): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
    #12 /mnt/sda3/PROJETOS/WEB/GPA/vendor/zendframework/zendframework/library/Zend/Mvc/Application.php(313): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
    #13 /mnt/sda3/PROJETOS/WEB/GPA/public/index.php(17): Zend\Mvc\Application->run()
    #14 {main}