PHP-Klasse::Animated CAPTCHA 13.06.2007
Kurzbeschreibung: captcha validation using animated math expressions
Veröffentlicht am: 13.06.2007
Gruppe(n):
- Graphics
- Security
- Validation
Beschreibung:
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.
Link: Animated CAPTCHA