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A '''diff''' is the difference between two versions of a page. It can be viewed from the page history: for every version there are potentially two [[w:radio button|radio button]]s: the left column is for selecting the older version, the right column for selecting the newer one. Pressing "Compare selected versions" gives the difference between the two versions.
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A '''diff''' is the difference between two versions of a page. It can be viewed from the page history: for every version there are potentially two radio buttons: the left column is for selecting the older version, the right column for selecting the newer one. Pressing "Compare selected versions" gives the difference between the two versions.
   Exception encountered, of type "Error"
[8c3af06b] /index.php?title=Help:Diff&diff=prev&oldid=2197 Error from line 434 of /home3/archetyp/public_html/wiki/includes/diff/DairikiDiff.php: Call to undefined function each()
Backtrace:
#0 /home3/archetyp/public_html/wiki/includes/diff/DairikiDiff.php(544): DiffEngine->diag(integer, integer, integer, integer, integer)
#1 /home3/archetyp/public_html/wiki/includes/diff/DairikiDiff.php(344): DiffEngine->compareSeq(integer, integer, integer, integer)
#2 /home3/archetyp/public_html/wiki/includes/diff/DairikiDiff.php(227): DiffEngine->diffLocal(array, array)
#3 /home3/archetyp/public_html/wiki/includes/diff/DairikiDiff.php(721): DiffEngine->diff(array, array)
#4 /home3/archetyp/public_html/wiki/includes/diff/DairikiDiff.php(859): Diff->__construct(array, array)
#5 /home3/archetyp/public_html/wiki/includes/diff/DairikiDiff.php(980): MappedDiff->__construct(array, array, array, array)
#6 /home3/archetyp/public_html/wiki/includes/diff/TableDiffFormatter.php(194): WordLevelDiff->__construct(array, array)
#7 /home3/archetyp/public_html/wiki/includes/diff/DiffFormatter.php(140): TableDiffFormatter->changed(array, array)
#8 /home3/archetyp/public_html/wiki/includes/diff/DiffFormatter.php(82): DiffFormatter->block(integer, integer, integer, integer, array)
#9 /home3/archetyp/public_html/wiki/includes/diff/DifferenceEngine.php(881): DiffFormatter->format(Diff)
#10 /home3/archetyp/public_html/wiki/includes/diff/DifferenceEngine.php(797): DifferenceEngine->generateTextDiffBody(string, string)
#11 /home3/archetyp/public_html/wiki/includes/diff/DifferenceEngine.php(728): DifferenceEngine->generateContentDiffBody(WikitextContent, WikitextContent)
#12 /home3/archetyp/public_html/wiki/includes/diff/DifferenceEngine.php(662): DifferenceEngine->getDiffBody()
#13 /home3/archetyp/public_html/wiki/includes/diff/DifferenceEngine.php(632): DifferenceEngine->getDiff(string, string, string)
#14 /home3/archetyp/public_html/wiki/includes/diff/DifferenceEngine.php(453): DifferenceEngine->showDiff(string, string, string)
#15 /home3/archetyp/public_html/wiki/includes/page/Article.php(797): DifferenceEngine->showDiffPage(boolean)
#16 /home3/archetyp/public_html/wiki/includes/page/Article.php(508): Article->showDiffPage()
#17 /home3/archetyp/public_html/wiki/includes/actions/ViewAction.php(44): Article->view()
#18 /home3/archetyp/public_html/wiki/includes/MediaWiki.php(490): ViewAction->show()
#19 /home3/archetyp/public_html/wiki/includes/MediaWiki.php(287): MediaWiki->performAction(Article, Title)
#20 /home3/archetyp/public_html/wiki/includes/MediaWiki.php(714): MediaWiki->performRequest()
#21 /home3/archetyp/public_html/wiki/includes/MediaWiki.php(508): MediaWiki->main()
#22 /home3/archetyp/public_html/wiki/index.php(41): MediaWiki->run()
#23 {main}