PHP增量增加一半 [英] PHP Increment by Half

问题描述

我有一个快速的问题，可能很容易回答.我已经四处搜寻，但是不确定是否正确搜索或搜索了什么.无论如何，使用PHP，我怎么能减半?

I have a quick question, which is probably easy to answer. I've goolged around, but not sure if I am searching correctly or what. Anyway, using PHP, how can I increment by halves?

例如，我知道我可以使用以下循环:

For example, I know I can use the following loop:

<?php 
for ($i=1; $i<21; $i++) {
    print($i);
}

它将打印1-20.

但是，如何获取类似于以下内容的输出:

But, how can I get it to output something like the following:

1
1.5
2
2.5
etc...

很抱歉，我对此一无所知，但我不确定该如何处理.谢谢！

Sorry for my ignorance on this, I'm just not sure how to go about it. Thanks!

推荐答案

将$i++更改为$i += 0.5.另外，要在每个行上打印每个数字，您需要使用\n(如果要将HTML输出到浏览器，则使用<br>).

Change $i++ to $i += 0.5. Also, to print each number on its own line you need to use \n (or <br> if you're outputting HTML to a browser).

for ($i = 1; $i < 21; $i += 0.5) {
    print($i . "\n");
}

上面的代码将打印20.5，因为它小于21.如果要打印最大值20，请更改循环条件以改为选择$i <= 20:

The above code will print 20.5 because it's less than 21. If you want to print a maximum of 20, change the loop condition to check $i <= 20 instead:

for ($i = 1; $i <= 20; $i += 0.5) {
    print($i . "\n");
}

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