Insert PHP function in Javascript

Can you please help me. How to add this PHP code:

<?php echo short_title(' ', 3); ?>

Here :

<a target="_blank" href="https://www.amazon.com/gp/search?ie=UTF8&tag=abc=<<<Insert PHP Code Here>>>">Comedies</a><img src="//ir-na.amazon-adsystem.com/e/ir?t=abc" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />