phpBB is an Internet forum package written in the PHP scripting language. The name "phpBB" is an abbreviation of PHP Bulletin Board. Available under the GNU General Public License, phpBB is free and open-source.
Features of phpBB include support for multiple database engines (MariaDB, Microsoft SQL Server, MySQL, PostgreSQL, SQLite, Oracle Database), flat message structure (as opposed to threaded), hierarchical subforums, topic split/merge/lock, user groups, multiple attachments per post, full-text search, plugins and various notification options (e-mail, Jabber instant messaging, ATOM feeds).
phpBB was founded by James Atkinson as a simple UBB-like forum for his own website on June 17, 2000. Nathan Codding and John Abela joined the development team after phpBB's CVS repository was moved to SourceForge.net, and work on version 1.0.0 began. A fully functional, pre-release version of phpBB was made available in July.
phpBB 1.0.0 was released on December 16, 2000, with subsequent improvements to the 1.x codebase coming in two more major installments. The final release in the 1.x line was phpBB 1.4.4, released on November 6, 2001. During the lifetime of the 1.x series, Bart van Bragt, Paul S. Owen (former co-manager of the project), Jonathan Haase, and Frank Feingold joined the team. phpBB 1.x is no longer supported, and virtually no websites continue to use it.
In February 2001, phpBB 2.0.x began development entirely from scratch; the developer's ambitions for phpBB had outgrown the original codebase. Doug Kelly joined the team shortly afterward. After a year of development and extensive testing, phpBB 2.0.0, dubbed the "Super Furry" version, was released on April 4, 2002, three days later than intended.
phpBB2 was the predecessor of the present-day phpBB3. Developed during 2001–2002, the source code was written primarily to run on PHP 3.0 and 4.0 (version 2.0.13 upped the minimum requirement to PHP 4.0.