Do you have active "remember file state" option in program settings / Files and dirs? If you will change highlighter to PHP, PSPad should remember highlighter for this file too and next time open file in PHP highlighter instead of MultiHTML. Simple use menu View / Change syntax or same functionality with toolbar button or click on the name of syntax on the PSpad statusbar.
-- <http://forum.pspad.com/read.php?4,63106,63107> PSPad freeware editor http://www.pspad.com
