在PHP中正确格式化数字

I am trying to format 2176 as 21.76 in php

I have this code: $Payment->amount equals 2176 in this example.

$<?php echo number_format($Payment->amount,'2')/100; ?>

I get 0.02 Why?

number_format($Payment->amount,'2') gives you string '2', then you divide it by 100, so the result is 0.02.

It should be:

$<?php echo number_format($Payment->amount / 100, 2); ?>

You need to do the division before you format the number:

$<?php echo number_format($Payment->amount/100,'2'); ?>