How to check if a unique array is in PHP?

Question

I want to know if an array has $arrduplicate elements.

Answer 1

array_unique() must work:

if (count(array_unique($arr)) == count($arr)) 
  echo "Array does not contain duplicate elements"; 
else
  echo "Array contains duplicate elements";

Answer 2

Check array_unique .

Answer 3

I am not sure if there is a built-in function for this. But you could do

if (count($arr) == count(array_unique($arr))
{
    //array has no unique elements
}