Try to add HtmlTag
decorator like this:
$form->setElementDecorators(array(
'viewHelper',
'Errors',
array('Label'),
array(
array('row'=>'HtmlTag'),
array('tag'=>'div', 'class'=>'form-group'),
),
array('HtmlTag', array('tag'=>'div', 'class'=>'col-md-6')),
));
For all elements, you can add a class like this:
Example to set form-control
class:
foreach($form->getElements() as $element){
$element->setAttrib('class', 'form-control');
}
Example to add form-control
class:
foreach($form->getElements() as $element){
$element->setAttrib('class', 'form-control' . ($element->getAttrib('class') == '' ? '' : ' ' . $element->getAttrib('class')));
}