Benchmarking SPL Iterators vs for / foreach ???

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Hi,

Someone have benchmarked SPL iterators vs for / foreach loops? What is the performance penalty?

SPL is ¨interpreted wrapper¨ on the top of C++ STL (correct me if I am wrong), and I am sure it uses STL callbacks. But unlike C++, PHP scripts are interpreted, so pointer arithmetic will work only through Zend engine which for sure  adds extra performance penalty.

Thanks in advance for any suggestion(s)


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***   with best regards 
***   Andrei Verovski (aka MacGuru)
***   Mac, Linux, DTP, Programming Web Site
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