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Unlike a compiled language like C++ or C, PHP code is not compiled directly to machine code. In fact, it is compiled to an intermediary bytecode which is later interpreted by the PHP runtime engine. This evaluation process allows PHP to be easily, quickly and efficiently ported to a several different platforms [0-40].

Figure 1 Unlike a compiled language like C++ or C, PHP code is not compiled directly to machine code. In fact, it is compiled to an intermediary bytecode which is later interpreted by the PHP runtime engine. This evaluation process allows PHP to be easily, quickly and efficiently ported to a several different platforms [0-40].