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Hi, Obviously I'm new here, and fairly new to PHP - so far this book has been very helpful and usually easy to follow. I got the 3rd edition from the library and got through Chapter 10 before ordering the 4th edition when it came out. So now I'm just skimming back through the early chapters to see what's different. The calculator script is quite different, and I was wondering about the method of checking if the form has been submitted. The earlier version used a hidden form input and checked if the value was set, the new one checks if $_SERVER['REQUEST_METHOD'] is POST. What's the differ