在数组php和sum值中搜索重复值

function findDuplicates($arr) {
    $hashTable = array();
    $duplicates = array();
    
    foreach ($arr as $value) {
        if (isset($hashTable[$value])) {
            $duplicates[] = $value;
        } else {
            $hashTable[$value] = true;
        }
    }
    
    return $duplicates;
}

$arr = array(1, 2, 3, 4, 2, 5, 6, 3);
$duplicates = findDuplicates($arr);
print_r($duplicates);

function findDuplicates($arr) {
    $counts = array_count_values($arr);
    $duplicates = array();
    
    foreach ($counts as $value => $count) {
        if ($count > 1) {
            $duplicates[] = $value;
        }
    }
    
    return $duplicates;
}

$arr = array(1, 2, 3, 4, 2, 5, 6, 3);
$duplicates = findDuplicates($arr);
print_r($duplicates);