zendframework/zf2-documentation — pull request #540 by Chionsas (2012-12-07 23:28:36+00:00)
Title: fixed grouped options example

Each optgroup should have an 'options' value, not the other way around.
The example previously did not work; now it does :)
Also, I added a 'label' entry, as options were not named without it. This might be a bug in FormSelect view helper.