Segment/passing to method problem

[eluser]bretticus[/eluser]
Do not assume that the parameter will be an array by default. Especially if it's optional. Do the type checking within the method (to tell you the truth I cannot think of one use case where an array needs to be passed from a controller method since the controller is "hooked" via the URL. Why call controller methods internally? Perhaps you can enlighten me.)

Code:

function index($additionalData = null) {
if is_array($additionalData) {
  // handle extra params.
}
}