Zend Framework 2 Setup default value if invalid input - php

Question

So I created a input filter (see below) but I have to test 24 fields to make sure they are all valid (only 1 listed below to keep this simple). In this case, the input is coming from an e-mail server, not a user, so I need accept the input, and not send an error back. However, I still need to check the data to ensure no one is messing with the headers / fields trying to mess everything up.
So my question is, how can I sent a default value for each input? For example blow, if the mailbox is length 0, something is wrong, so I just want to set the value to be something like 'InvalidMailbox' so I can still store this in the database,
public function getInputFilter()
{
if (!$this->inputFilter) {
$inputFilter = new InputFilter();
$factory = new InputFactory();
$inputFilter->add($factory->createInput(array(
'name' => 'mailbox',
'required' => true,
'filters' => array(
array('name' => 'StripTags'),
array('name' => 'StripNewLines'),
array('name' => 'StringToLower'),
array('name' => 'StringTrim'),
),
'validators' => array(
array(
'name' => 'StringLength',
'options' => array(
'encoding' => 'UTF-8',
'min' => 1,
'max' => 200,
),
),
),
)));
$this->inputFilter = $inputFilter;
}
return $this->inputFilter;
}
Calling it...
$mail = new SMail();
$inputFilter = $mail->getInputFilter;
$inputFilter->setData($data);
if ($inputFilter->isValid()) {
//echo "The form is valid\n";
} else {
// Maybe set the default here?
// but with 24 different fields, how can I know which one caused the error?
//echo "The form is not valid\n";
}

Answer 1

Okay, sorry that i didn't get the quest right first time. Going by the Source of the BaseInputFilter, there is a function called getInvalidInput(), so my assumption is, that you can do the following:
$defaultData = array(
'elementName' => 'Default Value'
);
$returnData = array();
if (false === $inputFilter->isValid()) {
$falseInputs = $inputFilter->getInvalidInput();
foreach ($falseInputs as $input) {
$returnData[$input->getName()] = $defaultData[$input->getName()];
}
}
$goodInputs = $inputFilter->getValidInput();
$finalData = array_merge($goodInputs, returnData);
This however is no tested code. I'm not sure if $input->getName() is available. You may need to adjust that part accordingly. I'm quite certain though that this should be able to get you started, hopefully ;)