Remove trailing slashes in FlightPHP url's

flight_remove_trailing_slashes.php

<?php
// before any other route
Flight::route('*', function () {
    $request = Flight::request();
    if ($request->url != '') {
        list($base, $query) = array_pad(explode('?', $request->url, 2), 2, null);
        if (substr($base, -1) == '/' && strlen($base) > 1) {
            $url = rtrim($base, '/');
            if ($query !== null) {
                $url .= '?' . $query;
            }
            Flight::redirect($url, 301);
            return false;
        }
    }
    return true;
});