Well it can be a shortcut for, for each loops.. like:
PHP Code:
temp.array = {1, 2, 3, 4, 5};
for (temp.i = (array.size()-1); i > 0); temp.i--) {
echo(array[i]);
}
for (temp.val: array.reverse()) {
echo(val);
}
But other than that this usually doesn't pop up much.