PHP Closures scoping of variables

Question

I am looking at the PHP example of Closures on http://us1.php.net/manual/en/functions.anonymous.php

It provides the example code below and states:

Answer 1

The two variable is question are what get passed into the callback by array_walk.

The first parameter will be passed as the value of each of the elements in the array, the second will be the key of the array.

The closed over variables are the ones referenced in the use clause.