Sorting With Minus¶
Did you know that sorting f, 0 and -f actually ends up with -f first, then 0, then f. And this works with any string, including strings with duplicate initial minus signs.
This is the SORT_REGULAR, with which PHP compares normally different pieces of data. Any string whose first character has an ASCII code lower than 0 will be sorted first (in PHP 8.2+) : this means characters up to /. Then any starting character beyond 9, aka colon : and beyond, are sorted after the 0 (and any digit).
That normal sort is used in ksort() and krsort() since PHP 8.2. This means that these functions may behave differently, when the keys string start with a - since.
This sort will sort string starting with - first: given the ASCII table, it also will sort strings starting with + before the -. Use this feature with caution.