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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？

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Release： 2016-06-23 13:42:31
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if(isset($_SERVER['HTTP_RANGE']) && !empty($_SERVER['HTTP_RANGE'])){
}


回复讨论(解决方案)

先isset是为了防止empty发警告。

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

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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？
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