使用小数PHP格式化int

I'm have this number

55550

But I it should be 555.50, I tried number_format() and sprinft but did not work.

Any idea? Thanks!

<?php

$num = 55550;
$num = (float) $num / 100;

echo number_format($num, 2, ".", "");

by casting the number to float, and dividing by 100 you can use number_format to change the format.