This is a solution to the problem of argument type based overloading in PHP. As far as I know this should work in PHP4 and PHP5.


class Viewer {
  function display($v) {
    $class = get_class($v);
    $function = "display_$class";
    if(method_exists($this, $function) ){
      $this->$function($v);
    } else {
      $this->display_default($v);
    }
  }
}

This class can then be extended and used like this:


class PDOViewer extends Viewer {
  function display_PDO($item) {
    echo "This is a PDO item";
  }
}
$viewer = new PDOViewer;
$viewer->display(new PDO);

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