我实在看不懂这语句{: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,有没有知道,帮忙解答一下,感激不尽
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