Hi!
zend engine and php internals are macro-oriented programing...
Zend Engine and PHP internals is not the code you deal with every day. Especially not the PHP code you deal with. PHP is supposed to be simple to read and understand, and heavy use of macros (like ZE code does) would certainly make such code very hard to understand for most people. In the guts of the engine, it doesn't matter too much, since not many people are supposed to read it anyway. In PHP, it does.
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