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; 
?>