It is desirable for some extensions to modify the pagination's base_url so that additional information can be preserved across forum view pages.
in viewforum.php lines ~650
$base_url = append_sid("{$phpbb_root_path}viewforum.$phpEx", "f=$forum_id" . ((strlen($u_sort_param)) ? "&$u_sort_param" : ''));
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/**
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* Modify the pagination's base url
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*
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* @event core.viewforum_modify_pagination_base_url
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* @var string base_url The URL to use when generating pagination
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* @since 3.1.0-b4
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*/
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$vars = array('base_url');
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extract($phpbb_dispatcher->trigger_event('core.viewforum_modify_pagination_base_url', compact($vars)));
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$pagination->generate_template_pagination($base_url, 'pagination', 'start', $topics_count, $config['topics_per_page'], $start);
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