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System Requirements for Asirra Captcha System - PHP

Asirra (Animal Species Image Recognition for Restricting Access) is a captcha technology developed by Microsoft. This article will explain how it's different from other captcha systems, the benefits of using Asirra, and how to set it up on your PHP-based website.

TABLE OF CONTENTS:
  1. Asirra Captcha PHP Integration
  2. How Asirra Works as a Captcha System
  3. System Requirements for Asirra Captcha System
  4. The Client Side Script of Asirra Captcha
  5. Complete Working Script and Implementation Technique
By: Codex-M
Rating: starstarstarstarstar / 2
July 28, 2010

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The following are the system requirements and PHP related functions that must be enabled to use Asirra captcha:

  • PHP version 5.3.1 (tested to work in this version, though it might work with versions below that number).
  • Apache web server (not tested in Windows server using PHP).
  • JavaScript enabled in the browser (most browsers has this turned on by default).
  • The use of PHP Globals (variable scope).
  • xml_parser_create
  • xml_set_element_handler
  • xml_set_character_data_handler
  • xml_parse
  • xml_parser_free

There is no need to worry about PHP related specifications, since most of the functions are enabled in most paid hosting accounts. If you are using a free hosting account, your hosting company might disable some of the required functions above, so the Asirra captcha function won't work properly.



 
 
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