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PHP CAPTCHA Tutorial
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PHP CAPTCHA Tutorial
http://www.anythingweb.org/PHP/phpCaptcha/
Captcha stands for "Completely Automated Public Turing test to tell Computers and Humans Apart" and is used for telling humans and computers apart. Many times, web sites will use Captcha on forms on forms to make sure the form is being filled out by a human. This tutorial will show you how to create a form with Captcha.
PHP > Tips and Tutorials > Security
Mar 17, 2008
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Other links at PHP > Tips and Tutorials > Security
This password protection is rather simple. I wouldn't advise you to use this for any major admin panels. Just keep it cool as there may be a exploit to bypass this.
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Hotlinking is when another website links directly to one or more of your images or multimedia files and includes it on their web page. Not only is this theft of your intellectual property, but further more, you are paying for the bandwidth used by that site. Which can result in a problem with your budget.
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Problems with common Hotlink Protection
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You may be thinking just exactly what is a captcha? Well you are likely to have already seen them across the web. They are those little images with a code on the front that you type into a box in order to submit something. This kind of system helps to prevent automatic submitting of an operation by some kind of program or robot. In this tutorial I will show you how to make a CAPTCHA just like the one below. Its not the most advanced captcha available because it uses a simple system font and nothing more
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