Quote:
Originally Posted by stevealmond
Most online forms now seem to use a unique code generated within an image to be keyed in by the user to authorise the form. How do you create these images and codes? Also I have read that this can be an irritant to users, and best avoided. Any thoughts?
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The technical term is CAPTCHA, see
CAPTCHA - Wikipedia, the free encyclopedia
Creating a CAPTCHA with PHP
Annoying? Yes, but people are getting used to them.