php预处理方式向mysql中插入多条数据

<?php

//mysql
$servername = "localhost";
$username = "root";
$password = "******";
$dbname = "yixzm";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
die("Connect Failed: " . $conn->connect_error);
}

//预处理，个人理解：封装数据库操作，简化多条数据场景下的提交过程
$stmt = $conn->prepare("insert into guests (name, email) values(?, ?)");
//i(int), s(string), d(double)
$stmt->bind_param("ss", $name, $email);

// add data to table
$name = "Sanji";
$email = "sanji@onepiece.com";
$stmt->execute();

$name = "Usopp";
$email = "usopp@onepiece.com";
$stmt->execute();

echo "Insert Successfully!";

$stmt->close();
$conn->close();

?>

$sql = "insert into guests (name, email)
values ('Luffy', 'luffy@onepiece.com')";

$name = "Sanji";

$stmt->execute();