CssSelector::getElementsByTagName PHP Метод

    protected function getElementsByTagName($nodes, $tagName, $combinator = ' ')
    {
        $founds = array();
        foreach ($nodes as $node) {
            switch ($combinator) {
                case ' ':
                    foreach ($node->getElementsByTagName($tagName) as $element) {
                        $founds[] = $element;
                    }
                    break;
                case '>':
                    foreach ($node->childNodes as $element) {
                        if ($tagName == $element->nodeName) {
                            $founds[] = $element;
                        }
                    }
                    break;
                case '+':
                    $element = $node->nextSibling;
                    if (isset($element->nodeName) and $element->nodeName == '#text') {
                        $element = $element->nextSibling;
                    }
                    if ($element && $tagName == $element->nodeName) {
                        $founds[] = $element;
                    }
                    break;
                case ':first-child':
                    foreach ($node->getElementsByTagName($tagName) as $element) {
                        if (count($founds) == 0) {
                            $founds[] = $element;
                        }
                    }
                    break;
            }
        }
        return $founds;
    }