Graphics: Equation Operating System
Jon Lawrence (contact me)
This class solves equations with multiple variables.
It does not resort to the PHP eval() function to help prevent security risks of using malicious expression values for instance with a calculator that takes expressions defined by the users.
It comes with a sub-class that can produce graphic charts plotting the curve defined by the equation expression withing a given range of x and y values. The generate chart graphics can be outputted in the PNG or JPEG formats using the GD library.
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Php Handleiding