How can I find the php.ini file used by the command line?

I need to enable *pdo_mysql* in my [EasyPHP][1] environment, so I went to the *php.ini* file and uncommented the following line: extension=php_pdo_mysql.dll Unfortunately I still have the same problem. I'm using the CLI so I suppose I need to locate the *php.ini* file used by the CLI. How can I find it? [1]: https://de.wikipedia.org/wiki/EasyPHP