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Variable substitutions in the skin template are all managed by the FmtPageName() function from pmwiki.php. Pmwiki variable substitutions available on pages are managed by the substitutions from stdmarkup.php or superseded in local/config files.

$WikiTitle: A variable which contains the Wiki title as displayed by the browser
$HTMLStylesFmt: An array of CSS statements to be included in the page’s output along with other HTML headers. This array provides an easy place for scripts to add custom CSS statements.
$HTMLHeaderFmt: An array of HTML text to be included in the page’s <head> section. This array provides an easy place for scripts to add custom HTML headers.

For example, if you want to specify a logo for all the pages of your wiki (a png image for Firefox (and others…), an ico for Internet Explorer):

  
      $HTMLHeaderFmt['$PageUrl'] =
         '<link rel="alternate" type="application/rss+xml" title="Rss All recent Changes" 
         href=""http://your/wiki/path/pmwiki.php/Site/
                  AllRecentChanges?action=rss&order=-time&count=0&list=normal" />'

Another example, if you want to get the rss notification on some browsers (the rss icon in firefox for instance):

  
      $HTMLHeaderFmt['$PageUrl'] =
         '<link href="http://your/wiki/path/to/your/logo/logo.png" type="image/png" rel="icon" />
         <link href="http://your/wiki/path/to/your/logo/logo.ico" type="image/x-icon" rel="shortcut icon" />'

$MessagesFmt: An array of HTML text to be displayed at the point of any (:messages:) markup. Commonly used for displaying messages with respect to editing pages.
$RecentChangesFmt: An array specifying the format of the RecentChanges listing.

The format can be specified in your config.php using the following:

  
      $RecentChangesFmt['$SiteGroup.AllRecentChanges'] = 
         '* [[$Group.$Name]] . . . $CurrentTime $[by] $AuthorLink: [=$ChangeSummary=]';
      $RecentChangesFmt['$Group.RecentChanges'] =
         '* [[$Group/$Name]] . . . $CurrentTime $[by] $AuthorLink: [=$ChangeSummary=]';

Note that changes made to the format will only affect new edits. In other words, you will need to edit a page for your new format to be visible. Note also that you need to have two spaces between the page name and the other information about the edit.

$RCLinesMax: The maximum number of lines to be stored in RecentChanges pages. The default is zero, meaning “no limit”.

        $RCLinesMax = 1000;       # maintain at most 1000 recent changes

$PageRedirectFmt: The text to be used when a page is redirected via the (:redirect:) markup.

        
        $PageRedirectFmt = '<p><i>redirected from $FullName</p>';
        $PageRedirectFmt = '';

$WikiStyle: An array which contains the predefined WikiStyles which can be used on a textpage.
See: PmWiki.CustomWikiStyles
$MaxIncludes: Controls the number of times that pages can be included via the (:include:) and other directives, used to control recursion and otherwise pose a sanity check on page contents. $MaxIncludes defaults to 50, but can be set to any value by the wiki administrator.

        $MaxIncludes = 50;            # default
        $MaxIncludes = 1000;          # allow lots of includes
        $MaxIncludes = 0;             # turn off includes

$Skin: Points to the directory of an own or different layout skin.
$SkinDirUrl: Set by scripts/skins.php to be the base url of the current skin’s directory (i.e., within a ‘pub/skins/’ directory). This variable is typically used inside of a skin .tmpl file to provide access to .css files and graphic images associated with the skin.
$PageLogoUrl: is the url that refers to a logo image which most skins display somewhere in the page’s header (top left usually).
$EnablePathInfo: Changes the handling of the page URL. When set to 1 page URL will be …wiki.php/Main/Main, when set to 0 (default) it will be …wiki.php?n=Main.Main.
$GroupHeaderFmt: Defines the markup placed at the top of every page. Default value is:

        $GroupHeaderFmt = '(:include $Group.GroupHeader:)(:nl:)';

$GroupFooterFmt: Defines the markup placed at the bottom of every page. Default value is:

        $GroupFooterFmt = '(:include $Group.GroupFooter:)(:nl:)';

$PageNotFoundHeaderFmt

Specifies the HTTP header to send when attempting to browse a page that doesn’t exist. Some webserver packages (notably Microsoft’s “Personal Web Server”) require that this variable be changed in order to work.

# default
$PageNotFoundHeaderFmt = 'HTTP/1.1 404 Not Found';
# return all pages as found
$PageNotFoundHeaderFmt = 'HTTP/1.1 200 Ok';

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PmWiki: Layout Variables