Zend Framework 2: Select Optgroups

On my project I’m currently working on I needed to use optgroups. After looking high and low through the documentation and the code I discovered the feature kind of worked, but kind of didn’t. I issued a pull request that fixed the code for the next release (2.0.1) but here’s the skinny on how to set it up.

When setting the valueOptions attribute of a SelectElement specify an array as follows for optgroup support.

    return array(
            array('label' => 'Jazz', 'options' =>
                array(
                    'Acid',
                    'Cool',
                    'Smooth'
                )
            ),
            array('label' => 'Rock', 'options' =>
                array(
                'Alternative Rock',
                'Folk Rock',
                'Garage Rock',
                'Hard Rock',
                'Heavy Metal'
                )
            )
        );