| <246841214>There is only one true, proven method of preventing automated submissions of forms: the 'image verification' mathod. For those unfamiliar, a random code is generated and displayed in the browser, and the end-user is asked to duplicate the random code in a form field. If the entered code matches the code on the image, obviously the user is not a robot - robots cannot read text on images! Robots can, however, read text displayed as text onto web pages, this is why images are used. It's a simple process really, and here is an application that I have written using PHP built-in GD image library to create an image, with a random font, with a random x-character code on it. |
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