Contao\MetaWizard::validator PHP Method

    public function validator($varInput)
    {
        if (!is_array($varInput)) {
            return null;
            // see #382
        }
        foreach ($varInput as $k => $v) {
            if ($k != 'language') {
                $varInput[$k] = array_map('trim', $v);
            } else {
                if ($v != '') {
                    // Take the fields from the DCA (see #4327)
                    $varInput[$v] = array_combine(array_keys($this->metaFields), array_fill(0, count($this->metaFields), ''));
                }
                unset($varInput[$k]);
            }
        }
        return $varInput;
    }