PHP从Array返回重复值

Question

i have array which has multiple duplicate values. now i want to get those duplicate values.

           $roQ = Array
           (
    [0] => 2123 
    [1] => 2094 
    [2] => 2105 
    [3] => 2160 
    [4] => 2143 
    [5] => 2148 
    [6] => 2154 
    [7] => 2155
    [8] => 2145
    [9] => 2123 
    [10] => 2149
     [11] => 2143 
     [12] => 2145

       )

i tried following code which is not working. it returns incorrect result. how to get the all duplicate values in new array.

   $c = array_count_values($roQ); 
       $val = array_search(max($c), $c);
      $azq[] = $val;

Answer 1

Try with -

$arr = array(1, 4, 6, 1, 8, 9, 4, 6);

$unique = array_unique($arr);

$duplicates = array_diff_assoc($arr, $unique);

var_dump($duplicates);