There is a feature in DW called 'balance braces' that will highlight everything between the opening and closing braces for PHP. It is very useful.
There is also some pretty good syntax error highlighting for PHP, so if you leave the simicolon off the end of a line, or something like that, it will alert you.
Unfortunately this is not available in DW's Code View at the moment.
This question has been asked in the past. Feel free to post your own Feature Request to Adobe.
Your only option at this stage is to use the other Coder tools available in DW.
Or use another code editor.