How to increment letters like numbers in PHP?

Question

I would like to write a function that takes in 3 characters and increments it and returns the newly incremented characters as a string.

I know how to increase a sing

Answer 1

You could use the ASCII codes for alpha numerics. From there you increment and decrement to get the previous/next character.

You could split your string in single characters and then apply the transformations on these characters.

Just some thoughts to get you started.