Can I put a PHP file inside JavaScript?

But as your question is not completely clear I will put some other points to cover everything. As JavaScript is a client side technology and PHP is Server Side so there is no way possible to put a PHP file inside JS code but if you are just concerned with the PHP data then you can use a API.
For More Information Please Refer:
https://www.quora.com/Can-I-include-a-PHP-file-inside-a-JavaScript-code
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