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$AbortFunction: A custom function name replacing the built-in Abort() function.
$EnableDiag

The following actions are available only if you set $EnableDiag = 1; in your configuration file. They can be used for debugging and should not be set in a production environment.

?action=ruleset

displays a list of all markups in 4 columns:

column 1 = markup-name (1. parameter of markup() )
column 2 = when will rule apply (2. parameter of markup() )
column 3 = PmWiki's internal sort key (derived from #2)
column 4 = Debug backtrace information for potentially incompatible rules (filename, line number, pattern)

(see Custom Markup Using the Markup() function for custom wiki syntax; migration to PHP 5.5 ).

To see more than what ?action=ruleset gives you, apply the Cookbook:MarkupRulesetDebugging recipe: it can also show the pattern and the replacement strings.

doesn't make use of PmWiki's authorization mechanisms.

?action=phpinfo

displays the output of phpinfo() and exits. No page will be processed

doesn't make use of PmWiki's authorization mechanisms.

?action=diag

displays a dump of all global vars and exits. No page will be processed

doesn't make use of PmWiki's authorization mechanisms.

$EnableMarkupDiag: By default, the "ruleset" action will display all markup rules, and the old-format patterns requiring update for PHP 7 will list with their files and line numbers. Setting $EnableMarkupDiag to 1 will list files and line numbers of all patterns. Note, this needs to be set early in config.php before a Markup() call or before including a recipe.
$EnableIMSCaching: A variable which, when set equal to 1, recognizes the "If-Modified-Since" header coming from browsers and allows browsers to use locally cached pages. Disabled by default to help the administrator customize its page without needing permanent reloading.
$EnableStopWatch: This activates an internal stopwatch that shows how long it takes to render a page. (If you have a wiki that composes a HTML page from multiple pages, such as a normal layout with a sidebar, you'll get separate timings for each subpage and for the total page.)
: The timings can be displayed by adding  in the wiki template.
: Valid values are:

        $EnableStopWatch = 0; # No timings (the default). No HTML will be generated.
        $EnableStopWatch = 1; # Wall-clock timings only.
        $EnableStopWatch = 2; # Wall-clock and CPU usage timings. Won't work on Windows.

: See Stopwatch for more details.