php pdo 连接MySQL数据库

<?php
$dbhost ="localhost";
$dbuser = "root";
$dbpwd = "123";
$dbname = "mydatabase";
$charName = "utf8";

try {
$conn = new PDO("mysql:host=$dbhost;port=3306;dbname=$dbname", $dbuser, $dbpwd, array(PDO::MYSQL_ATTR_INIT_COMMAND => "set names utf8"));
//echo "数据库链接成功！";
}
catch(PDOException $e){
echo $e->getMessage();
}
?>