php SimpleXML check if a child exists

Question

A->b->c might exist but c might not exist. How do I check it?

Answer 1

The 3 ways I can confirm work in PHP 5.5.23 were using isset() count() or empty()

Here is a script to show the results from each:

https://gist.github.com/mchelen/306f4f31f21c02cb0c24