PHP链接插入数据

<?php 
    $servername = "localhost:3305"; //数据库地址
    $username = "root";    //数据库name
    $password ="";     //密码
    $dbname      ="myDB";  //要链接的数据库

    $conn = new mysqli($servername,$username,$password,$dbname);
    // 面向对象的链接数据方法

    if($conn ->connect_error)
    {
        die('链接失败:' . $conn ->connect_error);
    }

    // 插入数据
    $sql = "INSERT INTO MyGuests (firstname, lastname, email)
    VALUES ('John', 'Doe', '[email protected]');";
    $sql .= "INSERT INTO MyGuests (firstname, lastname, email)
    VALUES ('Mary', 'Moe', '[email protected]');";
    $sql .= "INSERT INTO MyGuests (firstname, lastname, email)
    VALUES ('Julie', 'Dooley', '[email protected]')";


    if($conn ->multi_query($sql) === TRUE)
    {
        //判断 为true时 新纪录插入成功
        echo "新纪录插入成功";
    }else
    {
        echo "ERROR" . $sql . "<br>".$conn ->error;
    }


 ?>