php生成xml数据

public function static xml(){
    header("Content-type:text/xml;");
    $xml = "<?xml version=‘1.0‘ encoding=‘UTF-8‘?>\n";
    $xml .= "<root>\n";
    $xml .= "<code>200</code>\n";
    $xml .= "<message>数据返回成功</message>\n";
    $xml .= "<data>\n";
    $xml .= "<id>1</id>\n";
    $xml .= "<name>yangzl</name>\n";
    $xml .= "</data>\n";
    $xml .= "</root>\n";
    echo $xml;
}

Respine::xml();