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 are looking at a number representation problem. This is base24 (or however many numbers your alphabet has). Lets call the base b.

Assign a number to each letter in alphabet (A=1, B=2, C=3).

Next, figure out your input "number": The representation "ABC" means A*b^2 + B*b^1 + C*b^0 Use this formula to find the number (int). Increment it.

Next, convert it back to your number system: Divide by b^2 to get third digit, the remainder (modulo) by b^1 for second digit, the remainder (modulo) by `b^0^ for last digit.

This might help: How to convert from base10 to any other base.