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Precise Similar Topics Precise Similar Topics

A Similar Topics Extension for phpBB

This is an extension for phpBB that will find and display a list of similar (related) topics at the bottom of the current topic's page.

Build Status Scrutinizer Code Quality Latest Stable Version


  • Displays a list of the most similar/relevant topics at the bottom of the current topic page.
  • Similar topics are sorted by their relevance.
  • Adjust how many Similar Topics to display per page.
  • Adjust the age-span of topics to display (i.e.: display similar topics from the past year only).
  • Enable or disable similar topics in each forum.
  • Exclude specific forums from being searched for similar topics.
  • Specify which forums can share similar topics with other forums.
  • A query caching option reduces SQL overhead on large boards.
  • Permission settings for users and groups determine who can view similar topics (i.e.: don't show similar topics to guests).
  • Multi-lingual support for stop-words (common words that are ignored).
  • Multiple languages are supported. View the pre-installed localizations.
  • Compatible with most styles, more added with every release.
  • Built-in compatibility with my "Topic Preview" extension.


  • Overall winner of the 2010 "Summer of MODs" competition at
  • Featured MOD of the Week in the phpBB Weekly Podcast, episode #161.

Minimum Requirements

  • phpBB 3.1.0 or phpBB 3.2.0 or phpBB 3.3.0
  • PHP 5.3.3
  • MySQL, MariaDB or PostgreSQL database (SQLite, Oracle and MS SQL Server not supported)


  1. Download the latest validated release.
  2. Unzip the downloaded release and copy it to the ext directory of your phpBB board.
  3. Navigate in the ACP to Customise -> Manage extensions.
  4. Look for Precise Similar Topics under the Disabled Extensions list and click its Enable link.


  1. Navigate in the ACP to Customise -> Manage extensions.
  2. Click the Disable link for Precise Similar Topics.
  3. To permanently uninstall, click Delete Data, then delete the similartopics folder from phpBB/ext/vse/.


GNU General Public License v2

© 2013 - Matt Friedman