Package of PHP 5.6.12 does not support PowerPC based Macs (they are not being produced by Apple since 2009,
and are effectively unsupported by Apple). If you need support for PowerPC based Macs too, use package of 
PHP 5.2.10 or older.

Also this version of PHP requires Apache2-based web server on Windows, so if you select this version of PHP,
the Apache2-based core will be automatically enabled for Windows.