dbclassphp

<?php
    class dbclass
    {
        private $username ;
        private $password ;
        private $dsn;
        private $conn;
        public function __construct(){
            $this->username = "root";
            $this->password = "";
            $this->dsn = "mysql:host=localhost;dbname=db_coba";
        }
        public function openConnection(){
            try{
                $this->conn = new PDO($this->dsn,$this->username,$this->password) ;
                $this->conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
                echo 'Connection Success'."\n";
                return $this->conn;
            }
            catch(PDOException $e){
                echo 'Connection failed'."\n";
            }

        }
        public function closeConnection(){
            $this->conn = null;
            echo 'Connection closed'."\n";
        }
    }

?>