Parse error in PHP after saving in DW

Hi Folks-
I'm trying out DW on OS X Panther, and using Apache 2.0.48 and PHP 4.3.4.
When I enter php strings using heredoc syntax, DW returns a parse error
refering to the line of the closing identifier.
PHP files with that same syntax but written elsewhere (TextEdit) will open,
view and execute just fine. However, if I make any changes or save with a new
name, the parse error returns.

Any help woulb be appreciated.