src/Net/URL2.php
private function _isFragmentOnly()
    {
        return (
            $this->_fragment !== false
            && $this->_query === false
            && $this->_path === ''
            && $this->_port === false
            && $this->_host === false
            && $this->_userinfo === false
            && $this->_scheme === false
        );
    }
private function _isFragmentOnly()
    {
        return (
            $this->_fragment !== false
            && $this->_query === false
            && $this->_path === ''
            && $this->_port === false
            && $this->_host === false
            && $this->_userinfo === false
            && $this->_scheme === false
        );
    }
URL is fragment-only

@SuppressWarnings(PHPMD.UnusedPrivateMethod)
@return bool