From b2evolution manual
An Antispam Plugin is a plugin that implements methods to prevent/fight back at spam.
Creating an Antispam Plugin is the same as creating a "normal" plugin. This page only handles topics and introduces methods that are common to Antispam plugins.
Your plugin should implement the method GetSpamKarmaForComment(). This gets passed the following values in the $params function parameter array:
- "Comment": the comment object
The following values are interesting if you want to skip your test:
- 'cur_karma': current karma value (cur_karma_abs/cur_karma_divider)
- 'cur_karma_abs': current karma absolute value
- 'cur_karma_divider': current divider (sum of weights)
- 'cur_count_plugins': number of Plugins that have already been asked
Your plugin should return an integer value between -100 and 100, where -100 means "it's absolutely no spam" and 100 means "I'm damn sure this is spam.". If you don't want to return a spam probability value (e.g. because cur_karma is already above a certain value), just return NULL.
Step1: - if domain ends with '.info' => return 20 - if domain ends with '.biz' => return 30 - no match => return 0
Step2 - if domain contains 'search' => return 20 - no match => return 0
Step3 - if full url contains '-anal-' => return 80 - if full url contains 'anal' => return 20 - no match => return 0
Step4 - ..
The core then decides upon the results of
$karma_abs / $karma_divider
what to do with the comment. Your plugin provides a part of $karma_abs and $karma_divider is the total weight of the antispam plugins, which can be setup in Antispam Settings tab.