How can I increment a string in PHP with switching cases?

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I have a string that I want to increment but after it's done incrementing with uppercase I want it to switch to lowercase incremention.

XX
XY
XZ
YA
YB
YC
YD
YE
YF

What I want would give a resut like this:

XX
XY
XZ
Xa
Xb
Xc

asked 17 secs ago

user3140947

3

How can I increment a string in PHP with switching cases?