Mysqli volaná zevnitř třídy

class hlavicka {

  private $server;

  private $jmeno;

  private $heslo;

  private $databaze;

  private $mysqli;

  public function nastavit_db($server,$jmeno,$heslo,$databaze) {

    $this->server = $server;

    $this->jmeno = $jmeno;

    $this->heslo = $heslo;

    $this->databaze = $databaze;

  }

  $this->private = new mysqli($this->server, $this->jmeno, $this->heslo, $this->databaze) //zde je problém

}

$this->mysqli = new mysqli($this->server, $this->jmeno, $this->heslo, $this->databaze) //zde je problém

Parse error: syntax error, unexpected T_VARIABLE, expecting T_FUNCTION in skript on line 16