class DB
{
    protected $host = 'localhost';
    protected $db =   'name';
    protected $charset = 'utf8';
    protected $user = 'user';
    protected $pass = 'passw';

    public function __construct($host, $db, $charset, $user, $pass) {

        $dsn = "mysql:host=$host;dbname=$db;charset=$charset";
        $opt = array(
            PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
        );

        try {
            $this->DBconnect = $pdo = new PDO($dsn, $user, $pass, $opt);
        }
        catch( PDOException $Exception ) {
            if(!empty($Exception->getCode())){
                die('Ошибка');
            }
        }
    }
}