If you test the examples and like them, please feel free to implement your own solutions. However, there other ways to improve performance like function caching, or PHP script precompilation.

PHP’s move_uploaded_file method is then used to save the uploaded file to this new location. Run the JavaScript file upload example The files used in this example, along with a folder named upload, ...

Here's a quick tutorial on how to setup Nginx with PHP support. The key? The installation of fastCGI, aka PHP-FPM, so Nginx can serve PHP files to clients.