getNamedItem example

/** * Gets xliff file version based on the root "version" attribute. * * Defaults to 1.2 for backwards compatibility. * * @throws InvalidArgumentException */
    public static function getVersionNumber(\DOMDocument $dom): string
    {
        /** @var \DOMNode $xliff */
        foreach ($dom->getElementsByTagName('xliff') as $xliff) {
            $version = $xliff->attributes->getNamedItem('version');
            if ($version) {
                return $version->nodeValue;
            }

            $namespace = $xliff->attributes->getNamedItem('xmlns');
            if ($namespace) {
                if (0 !== substr_compare('urn:oasis:names:tc:xliff:document:', $namespace->nodeValue, 0, 34)) {
                    throw new InvalidArgumentException(sprintf('Not a valid XLIFF namespace "%s".', $namespace));
                }

                return substr($namespace, 34);
            }