php form-submission user-entry image protection

[adentone]

You know those little 5-7 alpha-numeric images that you have to enter before you can submit a form? I don't know how to do that, but I want to learn, or I would settle for a free script, too.

Does anyone know where I can find a tutorial or free script that does this?

Many Thanks!

[thinfile]

Such free scripts can be easily dug up in places like hotscripts. If you want to do it yourself the php GD functions are what you need.

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Thin Image Upload
Image upload with client side resize and thumbnail generation.