Rob Allen has posted another article about the ZendInput component of the Zend Framework (he talks about empty values here) this time covering the use of fallback values when the input doesn't contain the needed data.

Recently an issue was reported against ZendInputFilter where the reporter has discovered a regression where the fallback value wasn't being populated correctly. ?Matthew investigated, fixed it and asked me to review it. I was fascinated as I didn't realise (or had completely forgotten!) that ZendInput and ZendInputFilter supported fallback values so I looked into it and it turns out that it's simple and works exactly as its name implies.

He includes a simple example of a fallback for a name value set using the setFallback method on the Input object. He does point out one "wrinkle" in the functionality, however, dependent on the values set for required, allow_empty and continue_if_empty. Certain combinations could make the value either be returned differently than expected or not at all. He includes a small test script that shows the various combinations and what their expected output should look like.