<?php

class Database {

    private $db_name;
    private $db_user;
    private $db_pass;
    private $db_host;
    private $pdo;

    public function __construct($db_name = 'blog', $db_user = 'root', $db_pass = 'root', $db_host = 'localhost')
    {
        $this->db_name = $db_name;
        $this->db_user = $db_user;
        $this->db_pass = $db_pass;
        $this->db_host = $db_host;
    }

    private function getPDO(){
        if($this->pdo === NULL){
            $pdo = new PDO ("mysql:dbname={$this->db_name};host={$this->db_host}", "{$this->db_user}", "{$this->db_pass}");
            $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            $this->pdo = $pdo;
        }
        return $this->pdo;
    }
}

?>