InputFilter does not validate empty values

[zfbot]

Jira Information

Original Issue:	ZF2-523
Issue Type:	Improvement
Reporter:	Oliver Leisalu
Created:	09/05/12
Assignee:	weierophinney
Components:	Zend\InputFilter

Description

It is impossible to make a validator for case when value can be empty depending on other values.

For example, if some checkbox is checked, then empty value is allowed. If checkbox is not checked, empty value is not allowed.

checkbox name: doesNotHaveOwner (I understand that using negative is bad, but our case needs this behaviour)
input name: ownerName

if doesNotHaveOwner == 0, then ownerName is mandatory (As both are empty, then no validator is invoked)
if doesNotHaveOwner == 1, then ownerName can be empty.

[zfbot]

This issue was ported from the ZF2 Jira Issue Tracker at
http://framework.zend.com/issues/browse/ZF2-523

Known GitHub users mentioned in the original message or comment:
@weierophinney