Graphics: Animated CAPTCHA
Josh Storz (contact me)
This class can be used to perform CAPTCHA validation presenting to the users simple mathematical expressions as a sequence of animated pictures to make it difficult for robots to pass a form being validated.
It generates an animated GIF image that displays a mathematical expression of a simple operation between two random numbers, like sum, subtraction and multiplication.
The numbers and the operation are stored in session variables for posterior verification.
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Click here for detailed information about this class on phpclasses.org
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