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$result = ($prime_number * $input + $seed) % $max;

shuffle(5,10,0) == (7 * 0 + 5) % 10 == 5 % 10 == 5
shuffle(5,10,1) == (7 * 1 + 5) % 10 == 12 % 10 == 2
...
shuffle(5,10,7) == (7 * 7 + 5) % 10 == 54 % 10 == 4
shuffle(5,10,8) == (7 * 8 + 5) % 10 == 61 % 10 == 1
shuffle(5,10,9) == (7 * 9 + 5) % 10 == 68 % 10 == 8