ThinkPHP写数组插入与获取最新插入数据ID实例

public function insert2(){
 header("Content-Type:text/html; charset=utf-8");
 $Dao = M("User"); // 构建写入的数据数组
 $data["username"] = $_POST["username"];
 $data["password"] = md5($_POST["password"];);
 $data["email"] = $_POST["email"];
 $data["regdate"] = time(); // 写入数据
 if($lastInsId = $Dao->add($data)){  //$lastInsId为最新插入数据的id
 echo "插入数据 id 为：$lastInsId";
 } else {
 $this->error("数据写入错误！");
 }
 }