for和while的区别，那什么时候用for,什么时候用while,没有关系吧?

Answer 1

The difference between for and while, when to use for and when to use while, does it not matter? - PHP Chinese website Q&A - The difference between for and while, when to use for and when to use while, does it not matter? - PHP Chinese website Q&A

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Answer 2

一般当知道循环次数的时候采用for循环，当不知道循环次数的时候采用while