php保留两位小数的三种方法

<?php
$num1 = round(5,2);
$num2 = round(5.123,2);
echo $num1.PHP_EOL;
echo $num2.PHP_EOL;

b.输出：

5
5.12

<?php
$num1 = sprintf(‘%.2f‘,5);
$num2 = sprintf(‘%.2f‘,5.123);
echo $num1.PHP_EOL;
echo $num2.PHP_EOL;

b.输出：

5.00
5.12

<?php
$num1 = number_format(5,2);
$num2 = number_format(5.123,2);
echo $num1.PHP_EOL;
echo $num2.PHP_EOL;

b.输出：

5.00
5.12