this looks like a script that is included using a script tag with an url like.
<script src="path/to/script">
PHP to output anything to do with WP cannot be added to such a script. To add directly to this you would need to output the script inside of a template file something like
?>
<script>
// code of script here.
</scrip>
<?php
So that it is part of the HTML page and not a separate .js file
To add variable values to the type of script you are using it must be registered, localized and enqueued using WP hooks and actions https://developer.wordpress.org/reference/functions/wp_localize_script/
