a compatibility layer for running Windows programs. Wine does not require Microsoft Windows, as it is a completely free alternative implementation of the Windows API consisting of 100% non-Microsoft code, however Wine can optionally use native Windows DLL
these are samples, not complete applications. The code (and coding style) is not meant to be industrial strength; it's not even well-designed. The sole purpose of the samples is illustrating a point, not teaching proper coding style.
This is a review of 10 PHP frameworks. "PHP frameworks are the latest hot topic in the PHP community, and new frameworks are being released daily. With over 40 frameworks available it's difficult to decide which framework works best for you"