PHP：使用浏览器证书

Question

The scenario is this:

I've PHP back-end application that send /GET requests to another server on different host & domain.

The 2nd server need the user's browser certificate.

There is any way in PHP to forward the browser certificate to the request?

I'm using for the REST request with unirest, but if needed I'll switch framework or using cURL

I've tried Unirest\Request::verifyPeer(false); // Disables SSL cert validation but didn't succeed