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Tutorial and working script.

URL: http://woork.blogspot.com/2007/10/twitter-send-message-from-php-page.html

Securimage generates complex images and CAPTCHA codes to protect forms from spam and abuse. It does everything from generate complicated CAPTCHA images to making sure the code the user entered was correct.

Features:

• Show an image in just 3 lines of code
• Validate submitted entries in less than 6 lines of code
• Customizable code length
• Choose the character set
• TTF font support
• Use custom GD fonts when TTF is not available
• Easily add background images
• Multi colored, angled, and transparent text options
• Arched lines through text
• Generates audible CAPTCHA files in wav format
• Use a word list for creating CAPTCHA codes

URL: http://www.phpcaptcha.org/

Clever text class generates “clevertext” input fields that become editable on double click and automatically alter the database fields on change.

URL: http://www.garyhockin.co.uk/

No refreshing of the page is ever needed for this “web application” to work, as everything is updated in real-time via JavaScript.

URL: http://www.unwieldy.net/ajaxim