What are the advantages of using Node.JS compared to php

Curious about the node.js, seeing everyone is excited about this, but could some please answer the questions, I need to know before I commit some time into this.

What advantages does it offer over php?
Does things like connecting to databases still work the same way?
Is there any change to your work flow if using node JS
Is it better for websites or just apps?

Sorry to ask so many questions, but am am very time poor at the moment and I’m not sure if to invest the time into doing this and if there would be any gains.

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