Inspired by ShortestWikiContest, I've created WikWiki from scratch. It's 1287 characters long (17 lines) and written in PHP. WikiPrinciples are obeyed.
A new version of WikWiki with advanced features is available on GitHub: http://github.com/smasty/WikWiki
Features
Installation
No special installation is required, just copy the source.
Short source code version
"~-{4,}\r?\n~",'~(http(?:s)?)://([^\s]+)~i','~\n~'),array('$1
','$1',
'
','$2','
'),$c);preg_match_all('~([A-Z]\w+){2,}~',$r,
$x);foreach(array_unique($x[0])as$m){$r=str_replace($m,x($m)? "$m":
"$m?",$r);}return$r;}function f($f){@mkdir('wik');return
@file_get_contents("wik/$f.w");}function b($b){echo"Backlinks $b"
."
";}function x($f){
return file_exists("wik/$f.w");}function e($p){$p=$p?$p:$_GET['e'];echo"Edit"
." $p
License
WikWiki is licensed under the terms and conditions of the MIT License - http://opensource.org/licenses/mit-license
An author of the original WikWiki code is Martin Srank (http://smasty.net)