[SOLVED] Find duplicate array values

[rosenrosen]

I'm looking for a way to list all the duplicated values in an array (like the opposite of array_unique but not quite).  Given an array of ("a", "b", "c", "a", "d", "e", "d") I want to return ("a","d").  There has to be an easy answer but its eluding me.  Thanks.

[trq]

One idea.

 

<?php

  function get_unique($arr) {
    $ret = array();
    $counted = array_count_values($arr);
    foreach ($counted as $k => $v) {
      if ($v > 1) {
        $ret[] = $k;
      }
    }
    return $ret;
  }

?>

[.josh]

There are several comments in the array_unique entry on php.net that tackle getting the duplicate ones.

[trq]

Actually, thinking about it, might need some adjusting.

 

<?php

  function get_unique($arr) {
    $ret = array();
    $counted = array_count_values($arr);
    foreach ($counted as $k => $v) {
      if ($v > 1) {
        if (!in_array($k,$ret)) {
          $ret[] = $k;
        }
      }
    }
    return $ret;
  }

?>

 

Still not tested.