Kenjis\MonkeyPatch\PathChecker::normalizePaths PHP Method

    protected static function normalizePaths(array $paths)
    {
        $new_paths = [];
        $excluded = false;
        foreach ($paths as $path) {
            // Path starting with '-' has special meaning (excluding it)
            if (substr($path, 0, 1) === '-') {
                $excluded = true;
                $path = ltrim($path, '-');
            }
            $real_path = realpath($path);
            if ($real_path === FALSE) {
                throw new RuntimeException($path . ' does not exist?');
            }
            if (is_dir($real_path)) {
                // Must use DIRECTORY_SEPARATOR for Windows
                $real_path = $real_path . DIRECTORY_SEPARATOR;
            }
            $new_paths[] = $excluded ? '-' . $real_path : $real_path;
        }
        array_unique($new_paths, SORT_STRING);
        sort($new_paths, SORT_STRING);
        return $new_paths;
    }