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Creating a CAPTCHA with PHP by Andrew Walsh
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Creating a CAPTCHA with PHP by Andrew Walsh
http://codewalkers.com/tutorials/95/1.html
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
PHP > Tips and Tutorials > Security
Oct 16, 2006
Andrew Walsh
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Other links at PHP > Tips and Tutorials > Security
Anyone who operates their own website knows that you need to provide forms in your site for visitors to contact you. The big challenge is providing easy form access to your visitors, without letting SPAM flood your email inbox or database. The techniques described in this article tell you how to reduce the amount of SPAM.
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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.
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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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PHP password generator is a complete, working random password generation function for PHP. It allows the developer to customize the password: set its length and strength. Just include this function anywhere in your code and then use it.
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