zf2 validation form: How can I validate dependent fields? - zend-form

Question

I have 5 text form
$number1 = new Text('number-1');
$number2 = new Text('number-2');
$number3 = new Text('number-3');
....
with the relative filters
foreach(...)
$input = new Input($elementName);
$validator = new ValidatorChain();
$validator->addByName('Int')
->addByName('Between', array(
'min'=>0,
'max'=>$this->maxAllowedTicket,
'inclusive'=>true));
$filter = new FilterChain();
$filter->attachByName('Int');
$input->setValidatorChain($validator);
$input->setFilterChain($filter);
I would that only one of this 3 forms can contain a value different from 0.
There are then two possible errors.
TOO MANY NUMBERS
$data['number1'] = 5;
$data['number2'] = 5;
$data['number3'] = 0;
$data['number4'] = 5;
$data['number5'] = 0;
NO NUMBER
$data['number1'] = 0;
$data['number2'] = 0;
$data['number3'] = 0;
$data['number4'] = 0;
$data['number5'] = 0;
How can I validate this multiple fields at the same time ?

Answer 1

You need to write your own Validator class to do so. The isValid() method of your new validation class also receives the $context which includes the values of the whole form. This way you can validate the value of each field depending on the other fields.
namespace My\Validator;
use Zend\Validator\AbstractValidator;
class CustomValidator extends AbstractValidator
{
public function isValid($value, $context = null)
{
// put your logic here and call
// $this->error(); if required
}
}

Answer 2

Craft your own solution using the Callback validator.
Examples are here: http://packages.zendframework.com/docs/latest/manual/en/modules/zend.validator.set.html#callback