带有 SSL 证书的 PHP SOAP 客户端

I'm trying to set up a Soap client with the following code:

<?php
$wsdl           = 'https://domain.com/?wsdl';
$endpoint       = 'https://domain.com';
$certificate    = dirname(__FILE__) . '/CertWithKey.pem';
$password       = 'pwd';

$options = array(
    'location'      => $endpoint,
    'keep_alive'    => true,
    'trace'         => true,
    'local_cert'    => $certificate,
    'passphrase'    => $password,
    'cache_wsdl'    => WSDL_CACHE_NONE
);

try {
    $soapClient = new SoapClient($wsdl, $options);
} catch(Exception $e) {
    var_dump($e);
}

我得到了一个带有 .crt 认证文件的 .p12 密钥文件.使用 openssl 我已将 .p12 文件转换为 .pem 文件，然后将其与 .crt 文件合并.CertWithKey.pem 看起来不错，文件中有两个证书块.