FmtPageName(). For each element in the array, the "key" (interpreted as a string) will be replaced by the corresponding "value". The variable is intended to be a place to store substitution variables that have frequently changing values (thus avoiding a rebuild of the variable cache). Also see
FmtPageName. For each element in the array, the "key" (interpreted as a pattern) will be replaced by the corresponding value evaluated for the name of the current page. This is for instance used to handle $-substitutions that depend on the pagename passed to
FmtPageName(). Also see
$FmtPV['$VarName'] = 'variable definition';which can be used in markup with
#example for "source" action $PageAttributes['passwdsource'] = "$['Set new source password']"