Description:
------------
number_format fixes the number output from many decimals to a defined number. 

If you were to have a sufficiently small negative number, it will round and display "-0.00". I'd expect it to become zero, 

This has already been reported at https://bugs.php.net/bug.php?id=23866 however that is 13 years ago and it has not received a response.

Test script:
---------------
https://3v4l.org/oU2tg

<?php

$number = -1.15E-15;

var_dump($number);
var_dump(number_format($number, 2));

Expected result:
----------------
"0.00"

Actual result:
--------------
"-0.00"