Duplicate array values

[intenz]

How would I make a script that returns duplicate values in an array?

[erokar]

Here's a script for finding duplicates in one-dimensional arrays.

function duplicates($list) {

    $duplicates = array();
    $max = sizeof($list);

    for ($i=0; $i< $max; $i++) {

            // get element $i in list
            $element = $list[$i];

            // check if element is in remainder of array
            for ($j=$i+1; $j <= $max; $j++) {

                    if ($element == $list[$j]) {

                            // $element is a duplicate
                            $duplicates[] = $element;
                    }
            }
    }
    return $duplicates;

}