HTML diff engine derived from the MediaWiki Visual Diff module http://www.mediawiki.org/wiki/Visual_Diff.

Hosted on http://gitorious.org/htmldiff.

Sources:
http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/diff/HTMLDiff.php?view=markup&pathrev=58266
http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/diff/Diff.php?view=markup&pathrev=58266
http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/diff/Nodes.php?view=markup&pathrev=58266
http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/Sanitizer.php?view=markup&pathrev=58267
http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/Xml.php?view=markup&pathrev=58267

To use this, include the file htmldiff.php. The function html_diff($a, $b) is a helper function that returns
the difference between to HTML code strings as HTML code. It will assign the HTML class names diff-html-added
and diff-html-removed to changed content.


This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
or see http://www.gnu.org/