在小数点后打印PHP float 2位数？

Question

Is there an easy way to echo a float number with a specific amount of digits after the decimal point?

For example: $sum = 3.1234566768; I would like to echo $sum and get: 3.12 .

Answer 1

使用number_format（）

number_format($sum,2);

Answer 2

Try with:

$sum = 3.1234566768;
$rounded = round($sum, 2);

Answer 3

echo number_format($sum, 2); // 3.12

Answer 4

echo number_format((float)$ans, 4, '.', '');

我认为这会成功