執行PDO 中的預處理語句時一直不成功，想請教各路好漢指點迷津

Question

 <?php

     $servername ="localhost";

     $username = "root";

     $password = "";

     $dbname = "myDBPDO";

     try{

        $conn = new PDO("mysqli:host=$servernamedbdbname=$servername; ",$username,$password);

    //設定PDO錯誤模式為例外

        $conn->serAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

        //預處理SQL並綁定參數

##        //預處理SQL並綁定參數

##        //預處理SQL並綁定參數

        $stmt= $conn->prepare("INSERT INTO MyGus 是(firstname,lastname,email) VALUES(:firstname,:lastname,:email)");

        $stmt->bindParam(':firstname',$firstname );

        $stmt->bindParam(':lastname',$lastname);

        $stmt->bindParam(':email',$email);

email);

##        //傳入參數並且執行

        $firstname = "Jhon";

        $lastname = "Doe";

        $lastname = "Doe";

        $lastname = "Doe";

$email = "jhon@example.com";

        $stmt->execute();

        $firstname = "Mary";

        $firstname = "Mary";

#        $firstname = "Mary";

#        $firstname = "Mary";

##        $lastname = "Moe";

        $email = "mary@example.com";

        $stmt->

##        $firstname = "Julie";

        $lastname = "Dooley";

        $email = "julie@example.com";#  $eample.# #        $stmt->execute();

#        echo "新紀錄插入成功！ ";

     }catch(PDOException $e){

        echo  "Error:<br> ". $e->getMessage();

###     }###############     $conn=null;   ######    #### ; ;############

Answer 1

貼報錯誤  代碼  不然沒辦法看。 。