Php 如何在codeigniter中设置会话中的数组？

我在会话中设置数组时有点困难

这是我的密码：-

控制器：

function taketest(){
    $this->load->model('', '');
    $questions_for_test = $this->session->userdata('questions_for_test');
    $difficulty_level = $this->session->userdata('difficulty_level');
    $question_id = $this->session->userdata('question_id');
    if($question_id==""){
        $question_id = $this->myjcat->returnRandomQuestion($questions_for_test,$difficulty_level);
        $this->session->set_userdata('question_id',$question_id);
    }
    $question_details = $this->myjcat->getQuestion($question_id);
}

function returnRandomQuestion($questions_for_test, $difficulty_level){
    $question_id = array_rand($questions_for_test[$difficulty_level], 1);
    $used_question=array();
    $used_questions=$questions_for_test[$difficulty_level][$question_id];
    $this->session->set_userdata('used_questions',$used_questions);
    return $questions_for_test[$difficulty_level][$question_id];
}

型号：

function taketest(){
    $this->load->model('', '');
    $questions_for_test = $this->session->userdata('questions_for_test');
    $difficulty_level = $this->session->userdata('difficulty_level');
    $question_id = $this->session->userdata('question_id');
    if($question_id==""){
        $question_id = $this->myjcat->returnRandomQuestion($questions_for_test,$difficulty_level);
        $this->session->set_userdata('question_id',$question_id);
    }
    $question_details = $this->myjcat->getQuestion($question_id);
}

function returnRandomQuestion($questions_for_test, $difficulty_level){
    $question_id = array_rand($questions_for_test[$difficulty_level], 1);
    $used_question=array();
    $used_questions=$questions_for_test[$difficulty_level][$question_id];
    $this->session->set_userdata('used_questions',$used_questions);
    return $questions_for_test[$difficulty_level][$question_id];
}

但当我打电话时：

$used_questions = $this->session->userdata('used_questions');

内部控制器

---

在控制器中，它不会返回数组。它会给我存储在其中的最后一个值。

我可能误读了内容，但看起来您只存储了一个值

// this code:
$used_questions=$questions_for_test[$difficulty_level][$question_id];
$this->session->set_userdata('used_questions',$used_questions);

// is the same as this code
$this->session->set_userdata('used_questions',$questions_for_test[$difficulty_level][$question_id]);

您可能正在寻找以下内容：

// fetch the stored copy first.
$used_questions = $this->session->userdata('used_questions');
if(!is_array($used_questions)) $used_questions = array();
// note the []
$used_questions[] = $questions_for_test[$difficulty_level][$question_id];
$this->session->set_userdata('used_questions',$used_questions);

---

问题是

$used\u questions

存储的是

$questions\u中存储的值，用于测试[$defestibility\u level][$question\u id]

，而不是数组

---

这样做

$this->session->set_userdata（'used_questions'，$questions_for_test）
这是因为传递给$used\u问题的数据是一个值

您可能希望执行以下操作：

array_push($used_questions, $questions_for_test[$difficulty_level][$question_id]);

*向数组追加/添加新值
您可以在会话数据中设置如下数组值：-

$this->session->set_userdata('used_questions', json_encode($used_questions));

并检索以下数据：-

json_decode($this->session->userdata('used_questions'));

如果希望检索到的数组数据作为关联数组：-

json_decode($this->session->userdata('used_questions'), true);

希望它能帮助您：）
是的，它是相同的。但是每次调用此函数时，都会使用一个问题。因此，我需要制作一个数组，以便使用过的问题不能重复。这无法解决我的问题。因为$questions\u for\u test是问题总数的数组。但是我需要制作一个使用过的问题的数组。因此，这样做：$used_questions=$this->session->userdata（'used_questions'）$已使用的试题[$难度等级][$试题id]=$试题测试[$难度等级][$试题id]$此->会话->设置用户数据（'used\u questions'，$used\u questions）；这将允许您恢复会话中由de array存储的问题，然后将它们添加到新问题中。最后，使用set_userdata在会话中存储“新数组”（其中包含旧值和新值），重写使用键“used_questions”存储的旧数组