How to make a very basic captcha image and validate the form input to make sure the code matches. Does not use sessions of any sort. The image also just uses the built in PHP fonts so no need to load font files. I also put three random lines in the

we have hidden data in bitmaps, MIDI tracks and .NET assemblies, you might miss one important file format. You might miss the files that can hide lots of bytes without becoming larger, and can be generated in a few seconds, so that you don t have to