如何在Notepad ++中为输出JS的PHP文件设置语法高亮？

PHP is most commonly used to echo out HTML, but for this project I'm using PHP to echo out JavaScript.

How can I set syntax highlighting in Notepad++ to assume that anything outside of PHP tags is JS?

For example, in:

function(){
    var message='<?php echo 'value'; ?>';
}

I want the surrounding function and various marks to be highlighted like JS, not like HTML.

(I know anything inside of echo statements won't be highlighted as JS, so I'm not worried about that. Just JavaScript outside of the PHP tags)

I should probably feel ashamed for this answer, but it's such a quick shortcut I'm kinda proud of it.

<?php echo '//'; ?><script>
function(){
    var message='<?php echo 'value'; ?>';
}
<?php echo '//'; ?></script>

I'd still love an actual answer to this question as I've had a hard time figuring it out, but this fools Notepad++ into highlighting the JavaScript correctly and the <script> tags get commented out, so it works on both fronts for me.