插入的最佳方式。 或者，在显示钱时的整数

I have an integer 1000 - I would like to show it to the users as 10.00

I am wondering the best solution/practice for this?

Have tried the following, but none of these are the desired result:

<?php
echo number_format("1000")."<br>";
echo number_format("1000",2)."<br>";
echo number_format("1000",2,",",".");
?>

Outputs the following:

1,000
1,000.00
1.000,00