Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Open directory handle
<?php opendir(string $directory, ?resource $context = null): resource|false
<?php     private function doTree($dir, &$array)

    {

        if ($dh = opendir($dir)) {

            while ($file = readdir($dh)) {

                if ($file !== '.' && $file !== '..') {

                    if (is_link($dir.'/'.$file)) {