[dev] some optimization pointers

[Chuck Hagenbuch]

This is a *very* good read on how references and reference counting work in
PHP4:

http://www.zend.com/zend/art/ref-count.php

We can probably tune a lot of functions; I'm pretty sure that there are some
places where we take values by reference when we don't need to modify them.

This is slightly more jumbled, but also has some good tidbits:

http://phplens.com/lens/php-book/optimizing-debugging-php.php

-chuck

--
Charles Hagenbuch, <chuck at horde.org>
They're just looking at a wall of meat.