如何在 PHP 中四舍五入到最接近的整数小数

Question

不确定我是否正确解释了问题，但下面是一些我需要发生的事情的随机示例

20.39 变为 20.30

40.55 变为 40.50

9.22 变为 9.20

Answer 1

使用floor after multiplying by 10 and then divide by 10 again. To keep the second decimal place after rounding, use number_format.

$values = [20.39,40.55,9.22];
foreach ($values as $value) {
    echo number_format(floor($value * 10) / 10, 2);
}

输出：

20.30
40.50
9.20

How to round down to nearest whole decimal in PHP