Question

So I have a list of values like that goes like this:

values: n,b,f,d,e,b,f,ff`

I want to use preg_replace() in order to remove the repeated characters from the list of values (it will be inserted to a MySQL table). b and f are repeated. ff should not count as f because it’s a different value. I know that \b \b will be used for that. I am not sure on how to take out the repeated b and f values as well as the , that precedes each value.

Answer 1

No need for regex for this:

join(",", array_unique(split(",", $values)))