Migrate to memcached

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<http://pecl.php.net/package/memcached?

- add php-memcached to the install
- write memcache handler to bind to memcached
- integrate callabcks into
<http://us2.php.net/manual/en/memcached.callbacks.php>
- upgrade old memcache and memcachedsj26

Original issue reported on code.google.com by tyc...@gmail.com on 28 Apr 2009 at 5:14

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Also see http://gravitonic.com/2009/01/new-memcached-extension

Original comment by tyc...@gmail.com on 28 Apr 2009 at 5:15

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[deleted comment]

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also consider session.savehandler update
(note that the session.savepath chagnes also)

Original comment by tyc...@gmail.com on 28 Apr 2009 at 5:17

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Note that memcached has a rather robust multi-server support ("ByKey" appended 
to
everything), so marshalling can be done (thought it’ll be a little tricky).

To ensure backward compatibility, you're going to have to write a userspace
Memcached::getServerByKey()

Original comment by tyc...@gmail.com on 28 Apr 2009 at 5:29

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The previous is memcached_server_by_key() in C

Original comment by tyc...@gmail.com on 28 Apr 2009 at 5:31

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http://tangent.org/552/libmemcached.html

Original comment by tyc...@gmail.com on 28 Apr 2009 at 5:36

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http://www.burtleburtle.net/bob/hash/doobs.html

Original comment by tyc...@gmail.com on 28 Apr 2009 at 5:51