Description:
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If you just click on the downloads menu item on the home page, you get
to a very nice, simple page showing the latest available downloads - so
far, so good.  Most of the options are self-explanatory.

However, Win32 Debug Pack isn't, and a search for Debug Pack on the site
isn't helpful.  From the package size, I can infer that it's not a full
installation kit, but that's too subtle and still doesn't explain it. 
Is it just a library or a set of tools?  Is it mandatory if I want to do
any debugging, or merely helpful? 

I don't know whether a single line explanation is sufficient or a link
to some other page is needed.  But somewhere it needs to say what the
Debug Pack is, whether it's .zip or installer, why might I want it or
not want it, etc.  It's too big to be just a single dll, at least when
compared to the NuSphere dbg-php dll, but there's no way for me to tell
whether or not I might want it.

Many thanks, 
Gary

I hate that page.
I don't understand why we need so many windows downloads.

Just to answer your question: You don't need it.
The debug pack is only for those who need to debug PHP internals (the
language itself), for example when generating backtraces for bug
reports.

The debug pack are symbols packages (to simplify) needed to debug the
binaries without compiling php in debug mode. Debugger like WinDBG can
use them, we also explain how to use them to generate a backtrace.

They are exactly the same than every linux distribution provide (the dbg
packages).

Note to Hannes: They are not sources but binaries, if you still do not
understand why we have more than one single packages, please come back
to me with questions, I will be happy to answer them :)

I'm grateful for the prompt explanations, which certainly helps me now,
but I hope they don't impede improving the descriptions on the page.

Since these seem to be fairly specialized, I suggest moving both Debug
Packs towards the bottom, after all of the installers, with an
introductory paragraph reading something like "The Debug Packs provide
symbol definitions to help debug the PHP binaries (using tools such as
WinDBG).  They're unnecessary for debugging PHP scripts, and most people
won't need them."  

Thanks again.

Windows downloads now have separate page.