how to delete double values in array?

Question

I've got an array like this one:

arrayname[1] = "jacob";
arrayname[2] = "peter";
arrayname[3] = "jacob";
arrayname[4] = "nicholas";

I want to remove the double jacob so it will be like

arrayname[1] = "jacob";
arrayname[2] = "peter";
arrayname[3] = "nicholas";

How do I do that?

Answer 1

$array = array_unique($array);

Answer 2

array_unique()