问Zend框架2可选表单验证

EN

$inputFilter->add($factory->createInput(array(
    'name'     => 'foo_bar_input',
    'required' => true,
    'filters'  => array(
        array('name' => 'StripTags'),
        array('name' => 'StringTrim')
    ),

    // add your validators here         
    'validators' => array(
        // check to see if an input is empty
        array(
            'name'    => 'Zend\Validator\NotEmpty',
            'options' => array(),
        )
    )
)));

$validate = $this->getServiceLocator()->get('your_validator_class');
$form->setInputFilter($validate->getInputFilter());

if ($form->isValid()) 
{ 
    // do stuff
}