Pop\Form\Form::getElementIndex PHP Метод

    public function getElementIndex($elementName)
    {
        $name = null;
        $elem = null;
        $index = null;
        $elems = $this->form->getChildren();
        foreach ($elems as $i => $e) {
            if ($e->getNodeName() == 'fieldset') {
                $children = $e->getChildren();
                foreach ($children as $c) {
                    if ($c->getNodeName() == 'input') {
                        $attribs = $c->getAttributes();
                        $name = str_replace('[]', '', $attribs['name']);
                    }
                }
            } else {
                $attribs = $e->getAttributes();
                $name = $attribs['name'];
            }
            if ($name == $elementName) {
                $index = $i;
            }
        }
        return $index;
    }