PHP Classes

Another CAPTCHA project: CAPTCHA validation using animated images

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Version License Categories
animated_captcha 1.0.0FreewareGraphics, Validation, Security


This package can be used to perform human user validation using CAPTCHA images (Completely Automated Public Turing to tell Computers from Humans Apart).

It generates a sequence of animated images, assembled with in a GIF animation file, to make it more difficult to break by robots because the validation text does not completely appear in each of the animation images.

The text length, color and font are configurable.

Innovation Award
PHP Programming Innovation award winner
October 2006
CAPTCHA validation has become a widely adopted method to prevent that people use robot scripts to abuse from Web site content or services.

It uses images with fuzzy text to make it more difficult for robots that attempt to automatically read the text that is written. Meanwhile, several techniques have been developed to discover the text in the CAPTCHA validation images.

This class provides a more advanced solution that employs animated images to render the verification text.

It raises the bar in terms of the difficulty that it imposes to robots, as the actual text is never completely displayed in each of the animated image frames.

Manuel Lemos
Picture of László Zsidi
Name: László Zsidi <contact>
Classes: 13 packages by
Country: Hungary Hungary
Age: 50
All time rank: 331 in Hungary Hungary
Week rank: 42 Down2 in Hungary Hungary Down
Innovation award
Innovation award
Nominee: 10x

Winner: 1x

  • captcha.gif
  • Captcha_volume2.gif
  Files folder image Files  
File Role Description
Files folder imagecaptcha (1 file)
Files folder imagefonts (1 file)
Plain text file Captcha.class.php Class animated CAPTCHA creator class
Plain text file captcha.php Example CAPTCHA image resource file
Plain text file Captcha2.class.php Class Captcha.class.php - Volume 2
Plain text file index.php Example Example index file

  Files folder image Files  /  captcha  
File Role Description
  Plain text file captcha_files.txt Data CAPTCHA real files holder directory

  Files folder image Files  /  fonts  
File Role Description
  Plain text file fonts.txt Data Truetype fonts holder directory 65KB
Downloadanimated_captcha-2007-02-19.tar.gz 66KB
Install with ComposerInstall with Composer
Needed packages  
Class DownloadWhy it is needed Dependency
GIF images into animated GIF with native PHP class Download .zip .tar.gz Generating single animation Required
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