autoindex php

autoindex.php

<?php

declare(strict_types=1);

/** 
 * returns a plain string array of path to all files in a directory, and subdirectories,
 * but does not return directories themselves. (meaning if a directory is empty, it will not be included at all)
 * 
 * @param string $dir
 * @param bool $realpath
 * @throws UnexpectedValueException if $dir is not readable/does not exists
 * @return string[] files
 */
function get_file_list_recursively(string $dir, bool $realpath = false): array
{
    $files = array();
    $files = [];
    foreach ((new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir, RecursiveDirectoryIterator::SKIP_DOTS))) as $file) {
        /** @var SplFileInfo $file */
        if ($realpath) {
            $files[] = $file->getRealPath();
        } else {
            $files[] = $file->getPathname();
        }
    }
    return $files;
}
function tohtml(string $str): string
{
    return htmlentities($str, ENT_QUOTES | ENT_HTML5 | ENT_SUBSTITUTE | ENT_DISALLOWED, 'UTF-8', true);
}
chdir(__DIR__);
$files = get_file_list_recursively(".");
//$files = array_reverse($files);
sort($files,SORT_NATURAL);
//rsort($files);
$html = '';
foreach ($files as $filepath) {
    $filepath = str_replace("\\", "/", $filepath);
    if (str_starts_with($filepath, "./")) {
        $filepath = substr($filepath, strlen("./"));
    }
    $str = "<a href=\"" . tohtml(($filepath)) . "\">" . tohtml($filepath) . "</a><br>\n";
    $html .= $str;
}
echo $html;