javascript - Uncaught reference error for echo function in php -

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i have used follwoing php code snippet inside java script code(inside parent html). 

<script>     function setoptions(d) {         <?php             echo "test";         ?>     } </script>

when content saved , web page refreshed, following error,

uncaught referenceerror: test not defined

note- echo works when directly used inside html code.

any idea on how fix problem?

what want happen? when code parsed php sends browser (not valid javascript in function):

<script>     function setoptions(d) { test     } </script>

so produced needs valid javascript this: 

<script>     function setoptions(d) {         <?php             echo 'alert("test");';         ?>     } </script>

would produce valid javascript:

<script>     function setoptions(d) { alert("test");     } </script>

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