FOF30\Form\Form::findHeadersByGroup PHP Method

    protected function &findHeadersByGroup($group = null, $nested = false)
    {
        $false = false;
        $fields = array();
        // Make sure there is a valid JForm XML document.
        if (!$this->xml instanceof \SimpleXMLElement) {
            return $false;
        }
        // Get only fields in a specific group?
        if ($group) {
            // Get the fields elements for a given group.
            $elements =& $this->findHeader($group);
            // Get all of the field elements for the fields elements.
            /** @var \SimpleXMLElement $element */
            foreach ($elements as $element) {
                // If there are field elements add them to the return result.
                if ($tmp = $element->xpath('descendant::header')) {
                    // If we also want fields in nested groups then just merge the arrays.
                    if ($nested) {
                        $fields = array_merge($fields, $tmp);
                    } else {
                        $groupNames = explode('.', $group);
                        foreach ($tmp as $field) {
                            // Get the names of the groups that the field is in.
                            $attrs = $field->xpath('ancestor::headers[@name]/@name');
                            $names = array_map('strval', $attrs ? $attrs : array());
                            // If the field is in the specific group then add it to the return list.
                            if ($names == (array) $groupNames) {
                                $fields = array_merge($fields, array($field));
                            }
                        }
                    }
                }
            }
        } elseif ($group === false) {
            // Get only field elements not in a group.
            $fields = $this->xml->xpath('descendant::headers[not(@name)]/header | descendant::headers[not(@name)]/headerset/header ');
        } else {
            // Get an array of all the <header /> elements.
            $fields = $this->xml->xpath('//header');
        }
        return $fields;
    }