PHP Captcha Tutorial (for Beginners To Advanced Developers)

As the title of this post says, this tutorial was written with the beginning developer in mind, but yet it is about an advanced topic, so even seasoned developers will enjoy at least skimming through the code.

Of all the tutorials and pages upon pages of code I sifted through when initially working with dynamic graphics in PHP, such as a CAPTCHA script, I found that none of them were truly geared to the beginner, and as far as this topic is concerned, I was one. Sure, I know my way around PHP fairly well, but I was completely new to all of these functions and methods of development. I wanted to find that “perfect” site that spelled each line of code out for me to fully understand, but I found myself still grasping for something more. That said, I will try my best to explain every last bit of this script so that just about anyone with PHP experience can understand what is going on. I figured I can’t be the only person looking for such a thing… So here it is:

What we are going to eventually create is the fully-functional script you can see elsewhere on my web site. To give credit where credit is due, I got most of my inspiration and help from a fellow blogger, Joshua Houle, on his blog; however, I have added a rather large amount of customizability and tweaked his code quite a bit. On to the tutorial (you can download the code at the end)…

ONE NOTE BEFORE BEGINNING: THIS TUTORIAL REQUIRES THE GD LIBRARY TO BE ENABLED IN YOUR INSTALLATION OF PHP. THIS IS FURTHER EXPLAINED LATER IN THE TUTORIAL, BUT IF YOU KNOW FOR SURE WHAT I AM TALKING ABOUT, GO AND CHECK RIGHT NOW THAT IT IS ENABLED.

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