Array sorting case-sensitivity

Question

I'm just wondering why the ksort() function sorts uppercase keys first and then lowercase keys by default?

What is the logic beyond this?

Answer 1

It seems you're familiar with the fact that ksort() is case sensitive.

The reason is unclear to me, but there's an easy solution.

uksort() allows you to sort an array with an user-defined function, however, lazy as we are, we don't want to define our own function and use a native one. The function strcasecmp() allows us to compare a string in an case-insensitive way and works the very same way when we would define our own function. When a string has a high value, a value bigger than 0 is returned. If the value is smaller, a smaller value is returned and if it's equal, the function returns 0. So, a perfect candidate for our uksort() function.

This will work for you: $sorted = uksort($array, 'strcasecmp');

Answer 2

uppercase value smaller than lowercase values.

eg:- in ascii. A - 65, a - 97