<?php
class db{

    private $host = "localhost";
    private $username = "root";
    private $password = "";
    private $db_name = "mydb";
    private $conn;

    protected function connect(){

		$this->conn = new mysqli($this->host, $this->username, $this->password, $this->db_name);

		if (mysqli_connect_errno()){
   			printf("Connect failed: %s\n", mysqli_connect_error());
   		 	exit();
		}
		return $this->conn;
    }
}
?>