HTML multi-highlighter is special: If you don't want your PHP code to be highlighted with the HTML multi-highlighter, you have to select Settings -> Program settings -> Multihighlighter and uncheck PHP on the right, under the heading "Always open with ..."
-- <http://forum.pspad.com/read.php?2,33103,33115> PSPad freeware editor http://www.pspad.com
