Server-side processing returning own file contents

GcciBrd

Link to test case: https://github.com/Reynard-G/DC-Item-Price-Tracker
Debugger code (debug.datatables.net): https://debug.datatables.net/asezor
Error messages shown: None
Description of problem: When running the website on a live server from VSC, server_processing.php returns its own file contents instead of the MySQL data in the response header and can be seen in the console as well. When running server_processing.php independently, it returns the expected data from the MySQL Server. I'm not sure what I'm doing wrong and I appreciate any help I can get. Thanks!

colin

This SO thread should help, as it's discussing that. It's a problem with the website configuration and how it treats the PHP - if that first link doesn't solve the issue, there are a few extra options here.

Colin