Neos\FluidAdaptor\ViewHelpers\Form\AbstractFormViewHelper::prefixFieldName PHP Method

    protected function prefixFieldName($fieldName)
    {
        if ($fieldName === null || $fieldName === '') {
            return '';
        }
        if (!$this->viewHelperVariableContainer->exists(\Neos\FluidAdaptor\ViewHelpers\FormViewHelper::class, 'fieldNamePrefix')) {
            return $fieldName;
        }
        $fieldNamePrefix = (string) $this->viewHelperVariableContainer->get(\Neos\FluidAdaptor\ViewHelpers\FormViewHelper::class, 'fieldNamePrefix');
        if ($fieldNamePrefix === '') {
            return $fieldName;
        }
        $fieldNameSegments = explode('[', $fieldName, 2);
        $fieldName = $fieldNamePrefix . '[' . $fieldNameSegments[0] . ']';
        if (count($fieldNameSegments) > 1) {
            $fieldName .= '[' . $fieldNameSegments[1];
        }
        return $fieldName;
    }