PDO创建mysql数据库并指定utf8编码

<?php 
//PDO创建mysql数据库并指定utf8编码
header('Content-type:text/html; charset=utf-8');
$servername = "localhost";
$username = "root";
$password = "";
$dsn="mysql:host=$servername";

try {
    $pdo = new PDO($dsn, $username, $password);
    // 设置 PDO 错误模式为异常
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql = "CREATE DATABASE IF NOT EXISTS MY_DB DEFAULT CHARSET utf8 COLLATE utf8_general_ci";
    $result=$pdo->prepare($sql)->execute();
    echo "数据库创建成功<br>";
}
catch(PDOException $e)
{
    echo "<br>" . $e->getMessage();
} 

$pdo = null;
?>