php isset shorthand else返回数组无效

Question

I have this php code line

$data['viewData']['filter'] = isset($parameters['filter']) ? $parameters['filter'] : array('filter1', 'filter2', 'filter3', 'filter4');

Is something wrong with the isset shorthand because when I print_r($data['viewData']['filter'] with else being active, returns nothing/null/empty.

What could be wrong?

Edit, to add more info:

Code inside the controller:

if (isset($parameters['filter']))
{
    $data['viewData']['filter'] = $parameters['filter'];
}
else
{
    $data['viewData']['filter'] = array('filter1', 'filter2', 'filter3', 'filter4');              
}
$data['viewData']['query']   = $parameters['search'];
$data['viewData']['results'] = $searchResults;
$data['view'] = 'searchResults';
$this->load->view('includes/template', $data);

Code inside view:

prePrint($viewData['apis']);

And I get nothing when the else enters

Codeigniter is used as framework * prePrint is just a custom function that contains <pre> and print_r();

Answer 1

I don't really understand what you mean by it returns "nothing/null/empty" since a variable cannot return all 3 of those at once. isset doesn't check to see if any data exists, it only checks to see if the variable or array index is set, so if you have to make sure it's set and also contains data, you'll want to try this:

if (isset($parameters['filter']) && $parameters['filter'])