class forum{
  public $db;
  public $tpl;

  function enable_database(){
    require("includes/config/config.php");
    require("includes/database/database.php");
    
    $this->db=new db("mysql://".$config['db']['user'].":".$config['db']['pass']."@".$config['db']['host']."/".$config['db']['database']); 
  }
...
}

class db{
  private $dbtype;
  private $dbhost;
  private $dbdatabase;
  private $dbuser;
  private $dbpassword;

  private $connection;

  function __construct($dsn, $autoconnect=true){
    $result=preg_match("/(\w+):\/\/(\w+):(\w+)@(\w+)\/(\w+)/", $dsn, $matches);
    if($result){
      $this->dbtype=$matches[1];
      $this->dbuser=$matches[2];
      $this->dbpassword=$matches[3];
      $this->dbhost=$matches[4];
      $this->dbdatabase=$matches[5];
    }else return false;
    if($autoconnect)$this->connect();
}
...
}