SimplePie_Sanitize::strip_tag PHP Method

    protected function strip_tag($tag, $document, $xpath, $type)
    {
        $elements = $xpath->query('body//' . $tag);
        if ($this->encode_instead_of_strip) {
            foreach ($elements as $element) {
                $fragment = $document->createDocumentFragment();
                // For elements which aren't script or style, include the tag itself
                if (!in_array($tag, array('script', 'style'))) {
                    $text = '<' . $tag;
                    if ($element->hasAttributes()) {
                        $attrs = array();
                        foreach ($element->attributes as $name => $attr) {
                            $value = $attr->value;
                            // In XHTML, empty values should never exist, so we repeat the value
                            if (empty($value) && $type & SIMPLEPIE_CONSTRUCT_XHTML) {
                                $value = $name;
                            } elseif (empty($value) && $type & SIMPLEPIE_CONSTRUCT_HTML) {
                                $attrs[] = $name;
                                continue;
                            }
                            // Standard attribute text
                            $attrs[] = $name . '="' . $attr->value . '"';
                        }
                        $text .= ' ' . implode(' ', $attrs);
                    }
                    $text .= '>';
                    $fragment->appendChild(new DOMText($text));
                }
                $number = $element->childNodes->length;
                for ($i = $number; $i > 0; $i--) {
                    $child = $element->childNodes->item(0);
                    $fragment->appendChild($child);
                }
                if (!in_array($tag, array('script', 'style'))) {
                    $fragment->appendChild(new DOMText('</' . $tag . '>'));
                }
                $element->parentNode->replaceChild($fragment, $element);
            }
            return;
        } elseif (in_array($tag, array('script', 'style'))) {
            foreach ($elements as $element) {
                $element->parentNode->removeChild($element);
            }
            return;
        } else {
            foreach ($elements as $element) {
                $fragment = $document->createDocumentFragment();
                $number = $element->childNodes->length;
                for ($i = $number; $i > 0; $i--) {
                    $child = $element->childNodes->item(0);
                    $fragment->appendChild($child);
                }
                $element->parentNode->replaceChild($fragment, $element);
            }
        }
    }