PHP https access to webservice

In the test environment, PHP accesses webservice over http. Everything works normally.

But the production environment's webservice is https, and the program displays SOAP-ERROR: Parsing WSDL: Couldn't load from 'https: // ***/Service? Wsdl ': failed to load external entity "https: // ***/Service? Wsdl ", but directly open https: // ***/Service? Wsdl, returns normal.

Configuration environment:

Php server: WAMP

Webservice: LAMP

I checked the information for a day. I used to do this:

In windows, php_curl.dll and php_openssl.dll are required. curl depends on libeay32.dll, ssleay32.dll, and openssl depends on libeay32.dll.

That is, the PHP server needs to load the above modules.