" line, so they can never be read from the browser.
function load($n) {
    $f = DATA . "/$n.php";
    if (!is_file($f)) return [];
    $t = file_get_contents($f);
    $p = strpos($t, "\n");
    $d = $p === false ? null : json_decode(substr($t, $p + 1), true);
    return is_array($d) ? $d : [];
}
function save($n, $d) {
    return file_put_contents(DATA . "/$n.php", "