Exakat\Tasks\Export::display_text PHP Method

    private function display_text($V, $E, $root, $level = 0)
    {
        $r = '';
        if (isset($V[$root])) {
            $r .= str_repeat('  ', $level) . $V[$root]['code'] . "\n";
        }
        if (isset($E[$root])) {
            asort($E[$root]);
            uksort($E[$root], function ($a, $b) use($V) {
                if (!isset($V[$a]['rank'])) {
                    return 0;
                }
                if (!isset($V[$b]['rank'])) {
                    return 0;
                }
                return $V[$a]['rank'] > $V[$b]['rank'];
            });
            foreach ($E[$root] as $id => $label) {
                $r .= str_repeat('  ', $level) . 'Label : ' . $label . "\n" . $this->display_text($V, $E, $id, $level + 1);
            }
        }
        return $r;
    }