class FORUM {

	function __construct($DB_con)
    {
      $this->db = $DB_con;
    }

	public function getSubject() {
		try {
			$query = $this->db->prepare("SELECT * FROM posts");
			$query->execute();
		//retrieve the columns inside the table posts
			$forumrows = $query->fetchAll(PDO::FETCH_ASSOC);

		//Output each column Id with its Value
		foreach($forumrows as $forumrow) {
			foreach($forumrow as $key=>$value) {
				//echo the key and value.
        		echo "{$key} = {$value}<br>";
			}
		}

			} catch(PDOException $e) {
				echo $e->getMessage();
		}
	}
}

$forum = new FORUM($DB_con);
$forum->getSubject();