Certificate error? about google-api-php-client HOT 1 CLOSED

That means your server is unable to perform peer SSL certificate verification.

Since the Windows version of PHP and it doesn't come bundled with a Certificate 
Authority bundle, you need to add it yourself.

You need to add the following line to 
google-api-php-client/src/io/apiCurlIO.php right before the line "$data = 
@curl_exec($ch);"
curl_setopt($ch, CURLOPT_CAINFO, 'c:/path/to/ca-bundle.crt');

You'll need to replace 'c:/path/to/ca-bundle.crt' to where ever you have the 
ca-bundle.crt file.

Here's a good article explaining what's going on in the windows version of PHP.
http://richardwarrender.com/2007/05/the-secret-to-curl-in-php-on-windows/

See this thread for more information:
https://groups.google.com/d/msg/google-api-php-client/S1GBH6-2KOg/92zG1mlSFIIJ