Given some values, I'd like to make a (pretty darn) unique result.

$unique1 = generate(array('ab034', '981kja7261', '381jkfa0', 'vzcvqdx2993883i3ifja8', '0plnmjfys'));
//now $unique1 == "sqef3452y";

I also need something that's pretty close to return the same result. In this case, 20% of the values is missing.

$unique2 = generate(array('ab034', '981kja7261', '381jkfa0', 'vzcvqdx2993883i3ifja8'));
//also $unique2 == "sqef3452y";

I'm not sure where to begin with such an algorithm but I have some assumptions.

1. I assume that the more values given, the more accurate the resulting ID – in other words, using 20 values is better than 5.
2. I also assume that a confidence factor can be calculated and adjusted.

What would be nice to have is a weight factor where one can say 'value 1 is more important than value 3'. This would require a multidimensional array for input instead of one dimension.

I just mashed on the keyboard for these values, but in practice they may be short or long alpha numeric values.