What exactly doesn't work? I, myself, thought at some point that GD was so god damn hard. But then I delved into it, and using just the php.net reference I was able to create a captcha system of my own (a very basic one, but it worked). So it isn't that hard. After that, more followed (like a simple graph system, some statistics generators and even an image manipulation library). You just need to get the point. And practice

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