Sanitize::strip_tag( $tag, $document, $xpath, $type )

535    protected function strip_tag($tag, $document, $xpath, $type)536    {537        $elements = $xpath->query('body//' . $tag);538        if ($this->encode_instead_of_strip) {539            foreach ($elements as $element) {540                $fragment = $document->createDocumentFragment();541 542                // For elements which aren't script or style, include the tag itself543                if (!in_array($tag, ['script', 'style'])) {544                    $text = '<' . $tag;545                    if ($element->hasAttributes()) {546                        $attrs = [];547                        foreach ($element->attributes as $name => $attr) {548                            $value = $attr->value;549 550                            // In XHTML, empty values should never exist, so we repeat the value551                            if (empty($value) && ($type & \SimplePie\SimplePie::CONSTRUCT_XHTML)) {552                                $value = $name;553                            }554                            // For HTML, empty is fine555                            elseif (empty($value) && ($type & \SimplePie\SimplePie::CONSTRUCT_HTML)) {556                                $attrs[] = $name;557                                continue;558                            }559 560                            // Standard attribute text561                            $attrs[] = $name . '="' . $attr->value . '"';562                        }563                        $text .= ' ' . implode(' ', $attrs);564                    }565                    $text .= '>';566                    $fragment->appendChild(new \DOMText($text));567                }568 569                $number = $element->childNodes->length;570                for ($i = $number; $i > 0; $i--) {571                    $child = $element->childNodes->item(0);572                    $fragment->appendChild($child);573                }574 575                if (!in_array($tag, ['script', 'style'])) {576                    $fragment->appendChild(new \DOMText('</' . $tag . '>'));577                }578 579                $element->parentNode->replaceChild($fragment, $element);580            }581 582            return;583        } elseif (in_array($tag, ['script', 'style'])) {584            foreach ($elements as $element) {585                $element->parentNode->removeChild($element);586            }587 588            return;589        } else {590            foreach ($elements as $element) {591                $fragment = $document->createDocumentFragment();592                $number = $element->childNodes->length;593                for ($i = $number; $i > 0; $i--) {594                    $child = $element->childNodes->item(0);595                    $fragment->appendChild($child);596                }597 598                $element->parentNode->replaceChild($fragment, $element);599            }600        }601    }