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By piccoloprincipe
via catch404.net
Submitted: Mar 16 2013 / 06:44

One of the nice things about iterators is the ability to shove them into other iterators, allowing you to wrap their functionality in other functionality to return a more precise result set. Take for example the idea that we want to read a directory to list only the images inside of it. There are two main ways to do this, via opendir / readdir functions and via FilesystemIterator objects.
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