Fix #3698

turkishfix.php

<?php
/**
 * Rename all files affected by https://github.com/splitbrain/dokuwiki/issues/3698
 *
 * Upload this file to your DokuWiki root. It should be placed right next to the doku.php file. Then run
 * call it in your browser at https://yourserver.com/yourwiki/turkishfix.php
 *
 * Delete the file once you're done
 */
if (!defined('DOKU_INC')) define('DOKU_INC', __DIR__ . '/');
require_once(DOKU_INC . 'inc/init.php');

global $conf;
$path = $conf['savedir'];

$di = new RecursiveIteratorIterator(
    new RecursiveDirectoryIterator($path, FilesystemIterator::SKIP_DOTS)
);

foreach ($di as $name => $fio) {
    @set_time_limit(30);
    $old = $fio->getPathname();
    $new = str_replace('%C4%B1', 'i', $old);

    if ($old !== $new) {
        rename($old, $new);
        echo "$new<br>";
    }
}

Could the problem lie in the fact that the script only changes filenames and not directory names? I created extra namespaces for my media files, so the files itself lie in folders that - after running the script for a second time - still contain the Turkish "%C4%B1".