How to check whether a non-assoc array is unique in PHP?

I wan开发者_如何学Got to know whether the array $arr has duplicate elements.

array_unique() should work:

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

Check out array_unique.

I'm not sure there is a built in function for that. But you could do

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