我正在尝试将WSDL与php native SOAPCLIENT配合使用以发送local_cert，但我总是得到响应，请求中没有证书。这是代码：

$local_cert = "cert.pem";

try{
$client = new SoapClient($wsdl,array(
        "trace"         => 1,"exceptions"    => true,"use"           => SOAP_ENCODED,"soap_version"  => SOAP_1_1,"encoding"      => 'UTF-8',"local_cert"    => $local_cert,'authentication' => SOAP_AUTHENTICATION_DIGEST,'cache_wsdl' => WSDL_CACHE_NONE,));


$functionName  = "Ping";
$request_param = array(

);
    $res = $client->__call( $functionName,$request_param );
    echo '<h2>Request</h2><pre>' . htmlspecialchars($client->__getLastRequest(),ENT_QUOTES) . '</pre>';
    echo '<pre>'.var_dump($res,ENT_QUOTES) .' </pre>';

} catch ( SoapFault $e ) {
    trigger_error("SOAP Fault: (faultcode: {$fault->faultcode},faultstring: {$fault->faultstring})",E_USER_ERROR);
    $res = null;
}

cert.pem文件与三个文件ca.pem，client.pem和key.pem组合在一起

使用NUSOAPCLIENT并发送三个单独的证书文件，如下所示：

$crt = "ca.pem";
$key = "key.pem";
$pem = "client.pem";

$client->authtype = 'certificate';
$client->certRequest['sslcertfile'] = ($pem); # file containing the user's certificate
$client->certRequest['sslkeyfile'] = ($key); # file containing the private key
$client->certRequest['cainfofile'] = ($crt);  # file containing the root certificate

there is expected response from WS.