directory traversal in PHP 7.3

gistfile1.txt

<?php

/*
Directory traversal in PHP
see https://www.shellscript.sh/eg/directories/#traverse.sh (bash)
below one is in PHP 7.3 - Ubuntu

usage demo
1. cd <to ptrav.php>
2. $ php ptrav.php
 */

$dir_to_traverse = '.'; // current dir
$indent = 4;
funct($dir_to_traverse, $indent);
function funct($dir_to_traverse, $indent)
{
    $res = scandir($dir_to_traverse);

    // print_r($res);

    foreach ($res as $key => $value) {
        if ($value === '.' || $value === '..') {
            continue;
        }

        if (is_dir($dir_to_traverse .'/'. $value)) {
            echo str_repeat(' ', $indent)."dir -------- $value" . PHP_EOL;
            funct($dir_to_traverse .'/'. $value, $indent+4);
        }

        if (is_file($dir_to_traverse .'/'. $value)) {
            echo str_repeat(' ', $indent)."file -------- $value" . PHP_EOL;
        }
    }
}