PHP Decode

<?php 
 
Class Database{ 
  
	private $server = "mysql:host=localhost;dbname=tera"; 
	private $username = "root"; 
	private $password = ""; 
	private $options  = array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,); 
	protected $conn; 
 	 
	public function open(){ 
 		try{ 
 			$this->conn = new PDO($this->server, $this->username, $this->password, $this->options); 
 			return $this->conn; 
 		} 
 		catch (PDOException $e){ 
 			echo "There is some problem in connection: " . $e->getMessage(); 
 		} 
  
    } 
  
	public function close(){ 
   		$this->conn = null; 
 	} 
  
} 
 
$pdo = new Database(); 
  
?>