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

Question

I really don’t understand this statement {:isset($data['labels'][$vo['channel_id']])?$data['labels'][$vo['channel_id']][' title']:''} The meanings of $data['labels'][$vo['channel_id']] and $data['labels'][$vo['channel_id']]['title'] are I don’t know, please help me with the answer, I’d be very grateful