Basic Calculator

The PHP script below produces a very basic calculator. It's able to handle Addittion (+), Subtraction (-), Multiplacation (*) and Division (/). To fully understand the code, I suggest you have a good understanding of XHTML (in paticular forms), and a basic understanding of PHP (in paticular If statements and variables).

Everything is fairly straightforward. Paste the code into a PHP file, save it, and run it. Simple!

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