Symfony Howto: Call a variable Propel method

For Propel objects, you know how to call the class methods and constants:

$c = new Criteria();
$c->add(ItemPeer::PRICE, $price);
$items = ItemPeer::doSelect($c);

But what if the class or the constant name are variable? The call_user_func() and constant() PHP functions will help you:

public function doSelect($class, $column, $value)
{
  $class  = get_class(call_user_func(array(new $class, 'getPeer')));
  $column = strtoupper($column);
  
  $c = new Criteria();
  $c->add(constant($class.'::'.$column), $value);
  $results = call_user_func(array($class, 'doSelect'), $c);
  return $results;
}

$items = doSelect('Item', 'price', $price);