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the name zend refers to the language engine, php's core. the term php refers to the complete system as it appears from the outside. this might sound a bit confusing at first, but it's not that complicated (see 図24-1). to implement a web script interpreter, you need three parts:
php is such a huge and complex package that its inner workings can only be understood if you make yourself familiar with it by practicing, so we encourage you to work with the source.