SAML2\XML\mdui\Logo::__construct PHP Method

    public function __construct(\DOMElement $xml = null)
    {
        if ($xml === null) {
            return;
        }
        if (!$xml->hasAttribute('width')) {
            throw new \Exception('Missing width of Logo.');
        }
        if (!$xml->hasAttribute('height')) {
            throw new \Exception('Missing height of Logo.');
        }
        if (!is_string($xml->textContent) || !strlen($xml->textContent)) {
            throw new \Exception('Missing url value for Logo.');
        }
        $this->url = $xml->textContent;
        $this->width = (int) $xml->getAttribute('width');
        $this->height = (int) $xml->getAttribute('height');
        $this->lang = $xml->hasAttribute('xml:lang') ? $xml->getAttribute('xml:lang') : null;
    }