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Creating a CAPTCHA image with security code to validate forms
in PHP added by tutorialhelpdesk, on 5/3/2008 captcha form validation image security
In this tutorial you will learn to create a security code image generator, or a CAPTCHA image, that is so helpful against spammers.
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PHP Captcha Tutorial (in-depth)
in PHP added by techusky, on 2/1/2008 advanced tutorials captcha php5 security verification
This CAPTCHA script allows a user to easily customize things such as the string length, minimum and maximum font size, image size, the font used, and even the characters used, etc... Unlike most CAPTCHA scripts that generate the random text based on an md5 hash of the time, this one lets the user input specific numbers, uppercase, and lowercase characters they want used (or don't want used) in the creation of the CAPTCHA image. It also assures, regardless of the length of the string, that there is at least both 1 random upper and lowercase character in the string, thus making it more difficult for bots. Another feature in this script is that it randomly rotates each character on the image.
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GD Support Server Check with gd_info Function
in PHP added by ProgrammingPHP, on 2/8/2007 captcha image manipulation image verification media
Test your server's ability to use GD image manipulation through this script. If installed and supported, the GD library allows you to use CAPTCHA image verification and other forms of dynamic images.
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How to Create CAPTCHA Protection using PHP and AJAX
in PHP added by goodphptutorials, on 3/12/2006 AJAX advanced tutorials ajax captcha captcha
CAPTCHA is a simple test to determine if a user is a computer or a human. It is used to prevent spam abuse on the websites. The goal of this tutorial is to demonstrate how to make your own simple CAPTCHA protection using PHP and AJAX technologies.
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Visual Verification in PHP
in PHP added by goodphptutorials, on 7/4/2006 captcha security spam
Verification of form data is used to determine whether or not the submission is from a user or from a "bot". Most forms now include image verification for just this reason. This article will demonstrate how to create a simplified image verification system..
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PHP Security Image
in PHP added by goodphptutorials, on 3/4/2006 captcha image media security
This in depth tutorial will show you how to create a security image to prevent bots from flood-registering your site.
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