input filter - sinsunsan/archiref_wiki GitHub Wiki
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hook_filter_info
http://api.drupal.org/api/drupal/modules!filter!filter.api.php/function/hook_filter_info/7
New hook introduced for drupal 7, allow to define filters to be used "input filter" that are now called text formats. Filters manipulate the user input text. It's result is cached.