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为什么要判断isset后还要判断empty，直接判断empty不是代码更少吗？该怎么处理

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Release： 2016-06-13 12:12:37
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为什么要判断isset后还要判断empty，直接判断empty不是代码更少吗？
if(isset($_SERVER['HTTP_RANGE']) && !empty($_SERVER['HTTP_RANGE'])){
}
------解决思路----------------------
先isset是为了防止empty发警告。
------解决思路----------------------
只要 isset($_SERVER['HTTP_RANGE'])  就可以了
只要是断点续传，则 $_SERVER['HTTP_RANGE'] 一定不为空

Related labels：
empty isset nbsp range server
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