validator

gistfile1.txt

$inputFilter->add($factory->createInput(array(
              'name' => 'lon',
              'required' => true,
              'validators' => array(
                  array(
                      array(
                          'name' => 'NotEmpty',
                          'options' => array(
                              'messages' => 'message'
                          )
                      )
                  )
              )
  )));