使用php缩短长号

Question

如何用PHP缩短长号？所以像0.3483748937847832这样的数字会变成0.34

Answer 1

请先搜索stackoverflow - 来自PHP: show a number to 2 decimal places

number_format()

return number_format((float)$number, 2, '.', '');

https://stackoverflow.com/a/4483561/689579

或

$padded = sprintf('%0.2f', $unpadded); // 520 -> 520.00

https://stackoverflow.com/a/4483715/689579

Answer 2

使用回合

echo round（$ number，2）;