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PHP v6.0 For Linux 运行环境：Win9X/ WinME/ WinNT/ Win2K/ WinXP

organization of this directory is moving towards this approach:

<module>.h               -- public API and data types
<module>_private.h       -- protected API and data types
<module>.c               -- implementation and private API / types

The rules are:
.c files may include *_private.h.
.h files may not include *_private.h

This allows us to have a nicely encapsulated C api with opaque data types and private functions
that are nonetheless shared between source files without redundant extern declarations..