Should I Learn Node.js or PHP?

That was then. What about now?

I'm not sure Walmart's adoption of anything should matter in terms of IT.

I think Netflix's implementation is a bigger deal in terms of the adoption of node.JS. But it's based on Java.

There are jokes that you can do everything in Java except make coffee.

Node.JS is far better if you do long-polling, such as having many ports open for long periods of time. But not all applications require that.

PHP has more hosting options.

It doesn't have as many administrators to run it.

For a lot of applications, yes. But PHP still has a niche.

[martijnheil]

For god sake stop calling JavaScript Java!! They're 2 COMPLETELY different languages!

[ChristoKiwi]

Neither are any good. Check MeteorJS, its built on top of .node and is amazing!