問{:isset($data['labels'][$vo['channel_id']])?$data['labels'][$vo['channel_id']]['title']:''}

Question

我實在看不懂這語句{:isset($data['labels'][$vo['channel_id']])?$data['labels'][$vo['channel_id']][' title']:''}   中$data['labels'][$vo['channel_id']]和$data['labels'][$vo['channel_id']]['title']的意思，有沒知道，幫忙解答一下，感激不盡