This is the data being posted to my Zend Form for validation:
Array ( [cross_promotion_insert_categories] => Array
( [37908] => Antiques > Antiquities > The Americas [162922] => Antiques > Antiquities > Byzantine [162923] => Antiques > Antiquities > Celtic )
Is it possible to create a form element named 'cross_promotion_insert_categories' and add a custom validator to validate the array of values? Sub-forms wont work because you can't have a number for the form element name...