MivaScript Builtin Function, Miva Merchant 9+
miva_array_filter( array var, offset, element var, filter_expression, output var )
<mvt:assign name="g.return_value" value="miva_array_filter( array var, offset, element var, filter_expression, output var )" />
Iterate through an array starting at a given offset, execute a filter expression against each element, and copy the member to a new output array. See also miva_array_filter_ref.