[php] How do I run a file on localhost?

I'm not really sure what you mean, so I'll start simply:

If the file you're trying to "run" is static content, like HTML or even Javascript, you don't need to run it on "localhost"... you should just be able to open it from wherever it is on your machine in your browser.

If it is a piece of server-side code (ASP[.NET], php, whatever else, uou need to be running either a web server, or if you're using Visual Studio, start the development server for your application (F5 to debug, or CTRL+F5 to start without debugging).

If you're using a web server, you'll need to have a web site configured with the home directory set to the directory the file is in (or, just put the file in whatever home directory is configured).

If you're using Visual Studio, the file just needs to be in your project.

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