php多维数组删除重复

function remove_duplicates($array) {
    $result = array();
    $serialized = array_map('serialize', $array);
    $unique = array_unique($serialized);
    foreach ($unique as $key => $value) {
        $result[] = unserialize($value);
    }
    return $result;
}

function remove_duplicates($array) {
    $result = array();
    $json = array_map('json_encode', $array);
    $unique = array_unique($json);
    foreach ($unique as $key => $value) {
        $result[] = json_decode($value, true);
    }
    return $result;
}

function remove_duplicates($array) {
    $result = array();
    foreach ($array as $sub_array) {
        $flattened = implode('', $sub_array);
        if (!in_array($flattened, $result)) {
            $result[] = $sub_array;
        }
    }
    return $result;
}