PHP를 사용하여 MySQL 테이블을 만드는 방법은 무엇입니까?

<?php
// 连接到 MySQL 数据库
$servername = "localhost";
$username = "root";
$password = "mypassword";
$dbname = "myDB";

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

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

// 创建数据库（如果不存在）
$sql = "CREATE DATABASE IF NOT EXISTS $dbname";
if ($conn->query($sql) === TRUE) {
    echo "数据库创建成功";
} else {
    echo "数据库创建失败: " . $conn->error;
}

// 选择数据库
$conn->select_db($dbname);

// 创建表
$sql = "CREATE TABLE IF NOT EXISTS users (
    id INT NOT NULL AUTO_INCREMENT,
    username VARCHAR(255) NOT NULL,
    email VARCHAR(255) NOT NULL,
    PRIMARY KEY (id)
)";

// 执行查询
if ($conn->query($sql) === TRUE) {
    echo "表创建成功";
} else {
    echo "表创建失败: " . $conn->error;
}

// 关闭连接
$conn->close();
?>

// 连接到 MySQL 数据库
$conn = new mysqli($servername, $username, $password, $dbname);

// 创建表
$sql = "CREATE TABLE IF NOT EXISTS users (
    id INT NOT NULL AUTO_INCREMENT,
    username VARCHAR(255) NOT NULL,
    email VARCHAR(255) NOT NULL,
    PRIMARY KEY (id)
)";

// 执行查询
if ($conn->query($sql) === TRUE) {
    echo "表创建成功";
} else {
    echo "表创建失败: " . $conn->error;
}

// 关闭连接
$conn->close();