php和mysql程序设计

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
echo "连接成功";
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect误);
}

$stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $email);

$username = "john_doe";
$email = "john@example.com";

$stmt->execute();

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