Kiedy Śmieci

// Atomic file save with exclusive lock
function saveData($data, $filepath) {
    $json = json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);

    // Create unique temp file
    $temp = $filepath . '.' . uniqid('', true)
          . '.' . bin2hex(random_bytes(4));

    // Write to temp with exclusive lock
    $fp = fopen($temp, 'w');
    if (flock($fp, LOCK_EX)) {
        $written = fwrite($fp, $json);
        fflush($fp);
        flock($fp, LOCK_UN);
    }
    fclose($fp);

    // Atomic rename (POSIX guarantee)
    return rename($temp, $filepath);
}