I wanted to install Zend Framework 2. So I downloaded the skeleton application. As mentioned in the ZF2 manual, we have to issue the command
Verify you are editing the correct php.ini file.
Reference: https://github.com/composer/composer/issues/1440
"WAMP uses different php.ini files in the CLI and for Apache. when you enable php_openssl through the WAMP UI, you enable it for Apache, not for the CLI. You need to modify C:\wamp\bin\php\php-X.Y.Z\php.ini to enable it for the CLI."