How to create a database via PHP MySQL

<?php
$servername = "localhost";
$username = "username";
$password = "password";
// 创建连接
$conn = new mysqli($servername, $username, $password);
// 检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

$sql = "CREATE DATABASE myDB";if ($conn->query($sql) === TRUE) {    echo "数据库创建成功";} else {    echo "Error creating database: " . $conn->error;}$conn->close();?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
// 创建连接
$conn = mysqli_connect($servername, $username, $password);
// 检测连接
if (!$conn) {
    die("连接失败: " . mysqli_connect_error());
}

$sql = "CREATE DATABASE myDB";if (mysqli_query($conn, $sql)) {    echo "数据库创建成功";} else {    echo "Error creating database: " . mysqli_error($conn);}mysqli_close($conn);?>

<?php 
$servername = "localhost"; 
$username = "username"; 
$password = "password"; 
try { 
    $conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password); 
    // 设置 PDO 错误模式为异常 
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
    $sql = "CREATE DATABASE myDBPDO"; 
    // 使用 exec() ，因为没有结果返回 
    $conn->exec($sql); 
    echo "数据库创建成功<br>"; 
} 
catch(PDOException $e) 
{ 
    echo $sql . "<br>" . $e->getMessage(); 
} 
$conn = null; 
?>