handleDefaultNamespace(); } /** * @param string $nodeName * @return string */ public function createNodeName($nodeName) { if (empty($this->defaultNamespaceURI)) { return $nodeName; } return self::DEFAULT_NAMESPACE_PREFIX . ':' . $nodeName; } protected function handleDefaultNamespace() { $rootElements = $this->getRootElements(); if (count($rootElements) !== 1) { throw new \LogicException( sprintf('Got %d svg elements, expected exactly one', count($rootElements)), 1570870568 ); } $this->defaultNamespaceURI = (string)$rootElements[0]->namespaceURI; if ($this->defaultNamespaceURI !== '') { $this->registerNamespace(self::DEFAULT_NAMESPACE_PREFIX, $this->defaultNamespaceURI); } } /** * @return \DOMElement[] */ protected function getRootElements() { // Only `` elements directly under the document count, so look at its // children. Walking getElementsByTagName('svg') visited every `` in // the document, and before PHP 8.3 each step searched it again. $rootElements = []; foreach ($this->document->childNodes as $node) { if ($node instanceof \DOMElement && $node->tagName === 'svg') { $rootElements[] = $node; } } return $rootElements; } }