For循环或While循环-效率 [英] For Loop or While Loop - Efficiency

问题描述

这可能是一个愚蠢的问题，但是while循环的效率与for循环的效率相比如何?一直有人告诉我，如果您可以使用for循环，那么我应该这样做.但是，实际上之间的区别是什么?

This may be a stupid question, but how does the efficiency of a while loop compare to that of a for loop? I've always been taught that if you can use a for loop, then I should. But what actually is the difference between :

$i = 0;
while($i < 100) {
     echo $i;
     $i++;
} 

比较:

for($i = 0; $i < 100; $i++) {
    echo $i;
}

我知道在这些特定示例中，差异约为.000000001％，但是当我们谈论大型复杂循环时，差异是什么?

I know in these specific examples the difference is like .000000001%, but when we are talking about large complex loops, what is the difference?

推荐答案

您可以从大多数答案中猜到，for循环相对while循环的主要优点是可读性. for循环更干净，看起来也更漂亮.使用while循环陷入无限循环也容易得多.我要说的是，我同意您的教that，即如果您可以使用for循环，则应该这样做，只要您坚持这样做，您的编程经验就会更加有趣.

As you can guess from most of these answers, the main advantage of a for loop over a while loop is readability. A for loop is a lot cleaner and a lot nicer to look at. It's also much easier to get stuck in an infinite loop with a while loop. I would say that I agree with your teachings that if you can use a for loop, you should, so as long as you stick to that, your programming experiences will be much more enjoyable.

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