autoindex php

autoindex.php

<?php
declare(strict_types=1);
autoindex();
function autoindex()
{
    $tohtml = function (string $str): string {
        return htmlentities($str, ENT_QUOTES | ENT_HTML401 | ENT_SUBSTITUTE | ENT_DISALLOWED, 'UTF-8', true);
    };
    $files = [];
    $dir = new DirectoryIterator(dirname(__FILE__));

    foreach ($dir as $file) {
        $files[] = ($file->getFilename());
    }
    natsort($files);
    foreach ($files as $file) {
        $file_html = $tohtml($file);

        if ($file_html === '.') {
            $file_url = $file_html . '?' . $tohtml(http_build_query($_GET));
        }else{
            $file_url = $file_html;
        }
        echo "<a target='_blank' href='{$file_url}'>{$file_html}</a><br/>\n";
    }
}