UseModWiki.<ref>{{cite web |title=Wikipedia: The Free Encyclopedia |url=http://www.wikipedia.com |publisher=[[Bomis]</ref> The English edition switched to "[[Wikipedia:Phase II software|the PHP script]]" (phase II) on January 25, 2002, a new wiki software based on UseModWiki but rewritten in [[PHP]]. On July 20, "the PHP script" was then replaced by its own rewritten wiki software (phase 2003 |language=Catalan |date=13 November 2003}}</ref> On January 25, 2004, also the second [[Wikipedia:Magnus Manske Day|anniversary]] of the "PHP script", the last-remaining UseModWiki editions [[meta:Wikipedia software upgrade status|switched]] to MediaWiki.
== Use by Wikipedia ==
{{Multiple image|total_width = 600
| align = center
| header = English Wikipedia in 2001
| image1 = English Wikipedia HomePage 2001-02-19.png
| caption1 = February
| image2 = English Wikipedia HomePage 2001-12-20.png
| caption2 = December
| footer = UseModWiki supports both of camel case and "free links" for linking to another page.
}}
The wiki software for the [[English Wikipedia]] was UseModWiki (phase I, retroactively) since the establishment on January 15, 2001, and as of January 2002, Wikipedias in 22 languages were powered by UseModWiki.<ref>{{cite web |title=Wikipedia: The Free Encyclopedia |url=http://www.wikipedia.com |publisher=[[Bomis]] |access-date=25 June 2021 |archive-url=https://web.archive.org/web/20020124190441/http://www.wikipedia.com/ |archive-date=24 January 2002 |date=24 January 2002}}</ref> The English edition switched to "[[Wikipedia:Phase II software|the PHP script]]" (phase II) on January 25, 2002, a new wiki software based on UseModWiki but rewritten in [[PHP]]. On July 20, "the PHP script" was then replaced by its own rewritten wiki software (phase III), currently known as [[MediaWiki]], for better performance and functionality.
Other language editions gradually switched to MediaWiki afterwards, and as of late 2003, only a few active editions including [[Catalan Wikipedia]] were still powered by UseModWiki.<ref>{{cite web |title=Wikipedia: HomePage |url=http://ca.wikipedia.com/wiki.cgi |publisher=Catalan Wikipedia |access-date=2 April 2023 |archive-url=https://web.archive.org/web/20031113202541/http://ca.wikipedia.com/wiki.cgi |archive-date=13 November 2003 |language=Catalan |date=13 November 2003}}</ref> On January 25, 2004, also the second [[Wikipedia:Magnus Manske Day|anniversary]] of the "PHP script", the last-remaining UseModWiki editions [[meta:Wikipedia software upgrade status|switched]] to MediaWiki.
