file_get_contents() gives a 502 error in the browser
I have xampp running on my pc and I have php running (echo works).
When I try to get a webpage and echo it, it gives a 502 error
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What URL do you see in the browser address bar when it happens?
It displays: localhost:66422/%projectname%/%filename%.php
You're trying to get the web page with the built-in PhpStorm web server, not XAMPP.
To make it work, please configure a project PHP interpreter at Settings | Languages & Frameworks | PHP. If it still doesn't work after that, please share the code.