SOAP-ERROR：在PHP 5.2.17中解析WSDL

I'm trying to write a payment gateway.
I'm getting this error:

SOAP-ERROR: Parsing WSDL: Couldn't load from 'https://pgwstest.bpm.bankmellat.ir/pgwchannel/services/pgw?wsdl' : Start tag expected, '<' not found 

the code that is generating this is:

$mclient = new SoapClient('https://pgws.bpm.bankmellat.ir/pgwchannel/services/pgw?wsdl',array('soap_version'=>SOAP_1_2,'trace'=>1));

My PHP version is 5.2.17

What is the problem?

Thanks

You've to create stream_context for Mellat Bank in SoapClient object and pass it as 2nd parameter of object I hope it will work fine

$stream_context = stream_context_create(
  [
     'ssl' => array(
       'verify_peer'       => false,
       'verify_peer_name'  => false
    )
  ]
);
$your_soap_service_url='https://bpm.shaparak.ir/pgwchannel/services/pgw?wsdl';
$soap = new SoapClient($your_soap_service_url,  ['stream_context' => $stream_context]);