如何将本地WSDL文件加载到 SoapClient

$wsdl = __DIR__.'/wsdl.wsdl';
$this->client = new SoapClient($wsdl);

$xsd = __DIR__.'/wsdl/xsd/xmldsig-core-schema.xsd';

PHP致命错误:SOAP-error:解析WSDL:找不到任何可用的 在WSDL中绑定服务。

从WSDL文件到XSD文件的相对路径: ./xsd/xmldsig-core-schema.xsd

WSDL语言

<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" >
    <wsdl:types>
</wsdl:definitions>