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Hello everyone. I understand most of the code for the fuel calculator in chapter 3 Exercise 9. It is designed to calculate fuel costs and time taken for journey. This is based upon the Distance, the Cost per gallon and the fuel efficiency which are entered before the form is submitted. , It is only one page and most of the code is straightforward. However I haven't yet worked out why the $_POST[name] is not equivalent to 'gallon_price' after the form is submitted, since this is the default value as defined in the function create_radio and no value for the $name is declared anywhere else.
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