From Gzav's Wiki

PmWiki: Changes From Pm Wiki 1

Markup changes

• Double brackets are used for all links, including [[free links]]. Providing alternate text for a link is performed using either a vertical brace [[PageName | link text]] or an arrow [[link text -> PageName]]. See PmWiki.Links.
• So far, the ThisPage:, ThisGroup:, etc., InterMap shortcuts are not defined. In fact, they may not be needed in PmWiki 2. If someone needs them, add an entry to PITS:NewIssue explaining why.
  
  Ok, so as an example, how next lines, which are in a sidebar, may be written in pmwiki2 ?
  *[[ThisPage:?action=upload Upload]]
  *[[ThisGroup:SideBar&action=edit Edit menu]]

Changes affecting skins

• $PageTemplateFmt is obsolete, but $PageTemplateFmt still works, and this may change yet again before the 2.0 official release. To use a different skin, you can use the $Skin variable ($Skin = 'skinname';) and just fill it with the name of the skin, it will assume it's in the pub/skins/[skinname] folder containing the [skinname].tmpl file.
• $HTMLTitleFmt no longer exists -- just place the <title> information directly into the template.
• In $...Fmt strings, $Title_ and $Title are currently represented by $Name. $Title is now used to refer to a page's title (which may be different from its name and could have different formatting, such as spaces).
• The css/stdlayout.css file no longer exists; PmWiki and other modules now place required formatting styles directly into the $HTMLStylesFmt array.
• $PageName is now $FullName. $PageName still functions but will be removed in the 2.0 official release.
• Searching now uses the q= variable to provide the text to be searched (formerly the search text went in the text= variable.

Other Customization Changes

• PmWiki 2 now uses session-based authentication by default. If you want to continue to use HTTP-Basic authentication, add the following line to config.php:

        include_once('scripts/httpauth.php');

• Disabling WikiWords is now done by setting $LinkWikiWords . Previously this was controlled by $WikiWordCountMax .
• $HTMLLineBreak is now $HTMLPNewline. See Cookbook:Line Breaks.
• The skins system has been revised, and is now much more flexibly controlled by the $Skin and $ActionSkins variables. See PmWiki.Skins. But $PageTemplateFmt still works.
• The $BrowseReplacements, $DoubleBrackets, and $InlineReplacements arrays are no longer used -- see custom markup.
• ?action=post no longer exists -- posting a new page is now performed by using ?action=edit with the post control set to a true value.
• $WikiWordPagePathFmt is now $PagePathFmt, which is applied to all page links not qualified by a group.
• $WikiPageExistsFmt, $WikiPageCreateFmt, etc. are now $LinkPageExistsFmt, $LinkPageCreateFmt, etc.
• $DeleteKeyWord is now $DeleteKeyPattern.
• $GroupHeaderFmt and $GroupFooterFmt now specify the markup to be added to the beginning and end of each page, rather than the name of the page. The default settings of $GroupHeaderFmt and $GroupFooterFmt perform the equivalent of an (:include:) of the GroupHeader and GroupFooter pages.
• PmWiki's ReadPage() function no longer supplies default text for non-existent pages -- this is now decided by whatever functions need the page. (As of 2.0.devel9 the default text is still stored in $DefaultPageTextFmt, however.)
• $SearchExcludePatterns is now simply $SearchPatterns and can be chosen by the list= parameter to (:searchresults:) and (:pagelist:). See Cookbook:SearchResults.
• $EnablePerGroupCust is now $EnablePGCust.
• $TableCellAttr is now $TableCellAttrFmt.
• $Url is now $LinkUrl.