Sample of a helper

<?phpclass Harro_View_Helper_Alternate{	protected static $_currentField = null;		public function alternate($field1, $field2, $switch = true) {				if ($switch) {			if (self::$_currentField === null || self::$_currentField === $field2)				self::$_currentField = $field1;			else				self::$_currentField = $field2;		}		return self::$_currentField;	}}