Tobias Ratschiller, then an IT consultant and later founder of the software company Maguma, started to work on a PHP-based web front-end to MySQL in 1998, inspired by MySQL-Webadmin. He gave up the project (and phpAdsNew, of which he was also the original author) in 2000 because of lack of time.
By that time, phpMyAdmin had already become one of the most popular PHP applications and MySQL administration tools, with a large community of users and contributors. In order to coordinate the growing number of patches, a group of three developers registered The phpMyAdmin Project at SourceForge and took over the development in 2001. SourceForge hosts the software download. 
Before version 4, which uses Ajax extensively to enhance usability, the software used HTML frames.
Supports creating VIEWS from query results, manages triggers, procedures and functions. Improved interface for servers handling large number of databases/tables. Likely the last milestone supporting PHP 4.
September 27, 2008
Requires PHP 5.2 and MySQL 5+. Supports EVENT and TRIGGER.
Better support for vendor customization (based on Debian's needs), various bug and security fixes, and added minor features.
March 7, 2010
New import and export modules, changes tracking, synchronizing structure and data between servers, replication support.
May 11, 2011
Ajaxification of some parts, charts, visual query builder, user preferences, ENUM/SET editor
April 7, 2012
Browse-mode improvements, grid editing, remember recent tables, remember last sort order by table, flexible column width, reorder columns, more compact navigation bar, Ajaxification of many operations, reorganised server status page, with server monitoring, improved support for stored routines, events and triggers, openGIS support, zoom-search in table search, Drizzle support, improved ENUM/SET editor.
May 3, 2013
Major overhaul to the user interface, including the removal of frames and displaying the navigation panel in a tree view. The documentation has a completely new style.