data = $data; } public function offsetSet($offset, $value){ if(is_null($offset)) { $this->data[] = $value; } else { $this->data[$offset] = $value; } } public function offsetExists($offset){ return isset($this->data[$offset]); } public function offsetUnset($offset){ unset($this->data[$offset]); } public function offsetGet($offset){ return isset($this->data[$offset]) ? $this->data[$offset] : null; } } ?>