Below is sample code to create a radio button element with Yes/No options in Zend_Form. Any ideas on how to set the required answer to Yes, so if No is selected, it'll fail validation? The code below will accept either Yes or No.
$question= new Zend_Form_Element_Radio('question');
$question->setRequired(true)
->setLabel('Are you sure?')
->setMultiOptions(array('Yes', 'No'));
Not sure if this is the best way, but it worked for me:
$questionValid = new Zend_Validate_InArray(array('Yes'));
$questionValid->setMessage('Yes is required!');
$question = new Zend_Form_Element_Radio('question');
$question->setRequired(true)
->setLabel('Are you sure?')
->setMultiOptions(array('Yes'=>'Yes', 'No'=>'No'))
->addValidator($questionValid);