PHP-Klasse::Animated CAPTCHA 13.06.2007

abgelegt im Archiv PHP-Classes-News am 13.06.07

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