setting up a A/B split test with PHP

hi all,

I would like to test different page layout / creative elements of a
website using a A/B/C split run test.
How could I set it up using php?
Basically, I would like to include a different html code for different
visitors and see which gets the best click-through, conversions etc.
The stats tracking part it's not a problem , it's just how could I show
the first user the A version, then to the second the B version and then
the C one to the third and so on with the A version to the fourth etc.

How could it be the php script ? should I take note of the number of
visitors in a database and then doing some maths? but how ?

Please point me in the right direction

Thanks in advance
Johnny

.

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