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Processing XHR2 file uploads in PHP

My article "New Tricks in XMLHttpRequest2" has many fine examples, but what it doesn't have is any server code to illustrate how to handle files. If you're curious how to process a file upload using xhr.send(FormData), here's a quick example of an image upload in PHP.

This server is trivial but it demonstrates two things. The first is sending a file and extra payload at the same time. The second is how to grab the file (and other data) in PHP. Lastly, the image is encoded into a data: URL and included in a JSON response sent back to the client.