目前我在codeigniter会话大小方面面临问题。一些数据没有保存在会话变量中，但我需要这个。我在谷歌上找不到任何解决方案。这是我的一些会话代码。首先我为登录创建会话：
$this->session->set_userdata('member_loged', TRUE);
$this->session->set_userdata('uid', $uloged->id);
$this->session->set_userdata('user_name', $uloged->user_name);
$this->session->set_userdata('email', $uloged->email);
第二节考试代码：
$onlineexam = array();
$ukey = time();
$uid = $this->session->userdata('uid');
$onlineexam['uid'] = $uid;
$onlineexam['examid'] = $eid;
$onlineexam['ukey'] = $ukey;
$onlineexam['onlineexamdate'] = date('Y-m-d H:i:s');
foreach($allque as $que):
$quid = $que['id'];
$qa['queid'] = $quid;
$onlineexam['allq'][] = $qa;
$this->session->set_userdata('onlineexam', $onlineexam);
endforeach;
第三节通过ajax点击后添加在线考试：
$onlineexam = $this->session->userdata('onlineexam');
$ans['queid'] = $queid;
$ans['ansid'] = $ansid;
$ans['flag'] = $checkans;
$onlineexam['allanswer'][] = $ans;
$this->session->set_userdata('onlineexam', $onlineexam);
在 allanswer 变量中填充一些数据并错过最大数据