//...

public function LogIn($user, $password){
      if($user === $this->user && $password === $this->password){
          $_SESSION["LoggedIn"] = true;
          return true;
      }

      else if($user === $this->user && $password === md5($this->password)){
          $_SESSION["LoggedIn"] = true;
          return true;
      }

      else{
          return false;
      }
}

//...