I\'m using PHP-OpenId 2.1.3 which I\'ve unzipped on my server here (this is the consumer example that comes with PHP-OpenId). When I enter the Google OpenId url (https://www.goo
ketrun is right, I had a similar problem. After I installed the ca-certificates package, everything was fine, but when there is a problem with https requests, PHP Openid returns an error (invalid openid), not a blank screen.
Be sure to check the detect.php file from the examples dir and discover.php to check your OpenID URLs.