class Model {

public function foo() {

  $metaData = new ReflectionClass($this);
  $properties = $metaData->getProperties(ReflectionProperty::IS_PRIVATE);
  foreach ($properties as $property)
  {
      $property->setAccessible(true);
      print $property->getName() . " = ";
      print $property->getValue($metaData);
      print '<br/>';
  }

}

}