一个数组中包含对象，对象中包含数组取值

<?php
$arr = array();

$XSDocument = new XSDocument();

$data = array();
$data['id'] = '1';
$data['title'] = "死胖子";
$data['content'] = "吃粑粑.";

$XSDocument->add($data);

$arr = array($XSDocument);
header("Content-type:text/html;charset=utf-8;");

$hehe = new XSDocument($arr[0]);
$hehe->add($data);
$title = 'title';
$last = $hehe->getSome($title);

echo '<pre>';
var_dump($last);
echo '<br>';
echo '<pre>';
var_dump($arr);die;

class XSDocument{
private $class_name = '105';
public $name = 'xiaoqiang';
private $data_arr = array();
public function add($dat)
{
$this->data_arr = $dat;
}
public function getSome($a)
{
return $this->data_arr[$a];
}
}