how do i count how many DIFFERENT things are in an array....

[joyser]

ok, lets says i have an array that looks like this:

{1,3,2,3,5,1,2,3,1,2,3,1,5}

how do i find out how many different things are in that variable..in this case the anser would be "4" because there are four different things in it....

[JasonLewis]

Something like this:

$array = array(1,1,3,3,3,4,4,5,5,5,5);

echo count(array_unique($array));