I have installed Xampp on windows 7. When I try to run code I get the error
Warning: Module \'openssl\' already loaded in line 0
I had the same problem and there were not multiple extension=php_openssl.dll in my case. The reason was because I had two copies of apache for some reasons, but I only used one.
I deleted the copy and changed the environment variable Path and OPENSSL_CONF to point to the correct webserver.
After restarting the webserver it worked! Make sure to restart all terminals and CMDs, otherwise the old environment variables are used and the error persists.