Issue: https://github.com/php/php-src/issues/13074
Author: mvorisek
### Description
I would find more consistent explode if negative limit will return N parts from the end
like positive limit does from start. For limitting the actual additional param should be added. This
will be consistent with other functions with negative limit.
repro: https://3v4l.org/u9WM3
```diff
Array
(
[0] => a
[1] => b-c-d
)
Array
(
[0] => a-b-c
[1] => d
)
```