collector.php
protected function removeTrailingSlash($path)
    {
        if (substr($path, -1) == DIRECTORY_SEPARATOR) {
            return substr($path, 0, -1);
        } elseif (substr($path, -1) == '/') {
            return substr($path, 0, -1);
        } else {
            return $path;
        }
    }
protected function removeTrailingSlash($path)
    {
        if (substr($path, -1) == DIRECTORY_SEPARATOR) {
            return substr($path, 0, -1);
        } elseif (substr($path, -1) == '/') {
            return substr($path, 0, -1);
        } else {
            return $path;
        }
    }
Strips off any kind of slash at the end so as to normalise the path.

@param string $path Path to normalise.

@return string Path without trailing slash.