connect class

<?php
class connect
{
    protected $username;
    protected $password;
    protected $dbname;
    protected $host;
    public $pdoo;
    function __construct()
    {
        $this->username = 'root';
        $this->password = '';
        $this->dbname = 'blog';
        $this->host = 'localhost';
        $this->connectToDb($this->username, $this->password, $this->host, $this->dbname);
    }
    protected function connectToDb($username, $password , $host, $dbname){
        try {
        $pdo = new PDO('mysql:host=' .$host .';dbname=' .$dbname, $username, $password);
        $pdo->setAttribute(PDO::ATTR_ERRMODE , PDO::ERRMODE_EXCEPTION);
        $this->pdoo = $pdo;
        } catch (PDOException $e) {
        echo $e->getMessage();
            }
    }
}

?>