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    <p>You are the wiser ninja, grasshopper. </p> <p>Autoloaders don't load the class file until the class is requested.  This means that they will use at most the same amount memory as manual includes, but usually much less.</p> <p>Classes get read fresh from file each request even if an apache thread can handle multiple requests, so your friends 'eventuall all are read' doesn't hold water. </p> <p>You can prove this by putting an echo 'foo'; above the class definition in the class file. You'll see on each new request the line will be executed regardless of if you autoload or manually include the whole world of class files at start.</p> <p>I couldn't find any good concise documentation on this--i may write some with some memory usage examples--as i also have had to explain this to others and show evidence to get it to sink in. I think the folks at zend didn't think anyone would not see the benifits of autoloading.</p> <p>Yes, apc and such (like all caching solutions) can overcome the resouce negatives and even eek out small gains in performance, but you eat up lots of unneeded memory if you do this on a non-trivial number of libraries and serving a large number of clients. Try something Like loading a healthy chunk of the pear libraries in a massive include file while handling 500 connections hitting your page at the same time. </p> <p>Even using things like Apc you benefit from using autoloaders with any non-namespaced classes (most of the existing php code currently) as it can help avoid global namespace pollution when dealing with large umbers of class libraries.</p>
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