Using multidimensional arrays with iterators

- The SPL iterator for multidimensional arrays…is called rather predictably, RecursiveArrayIterator.…To demonstrate how it works,…I've opened recursive_array.php, which you can find…in the Chapter Four folder of the exercise files.…It contains a multidimensional…associative array called, "Products."…So let's convert this into an Iterator.…We'll keep the same name, "products," "new,"…"RecursiveArrayIterator," and we pass it the array,…which is called, "products."…Because it's recursive, we need to use…RecursiveIteratorIterator, so "products," "new,"…"RecursiveIteratorIterator,"…and we pass it our "products" Iterator.…

And we're dealing with an associative array,…so we need both the parents and the children.…By default, RecursiveIteratorIterator…only gets the children, so we need…to reset the mode to SELF_FIRST.…So that's the second argument to RecursiveIteratorIterator.…It's a class constant, so…"RecursiveIteratorIterator," then SELF_FIRST.…So we can now use a foreach loop…to go over our RecursiveArray.…When we loop over the products iterator,…