Question

我一直致力于制作测验应用程序而且我一度陷入困境。我正在使用PHP和MySQL来实现它。 所以，我现在想要随机检索数据库中的问题。但是，当我尝试将 rand（）与问题一起使用时，它的选择与应有的不同。 我该怎么做将问题的随机性与答案同步。

class Quiz {

protected $_db;
protected $_answers = array();
protected $_questions = array();
protected $_question;
protected $_users;
protected $_leaderboard;
protected $_currentuser;

public $session;

public function __construct(\Pimple $container)
{
    $this->_currentuser = $container['user'];

    $this->session = $container['session'];
    $this->_leaderboard = $container['leaderboard'];
    $this->_users = $this->_leaderboard->getMembers();

    try
    {
        //$this->_db = new PDO('mysql:host='.Config::$dbhost.';dbname='.Config::$dbname,  Config::$dbuser,  Config::$dbpassword);
        $this->_db = $container['db'];
        $this->_populateQuestions();
    }
    catch (\PDOException $e)
    {
        return $e;
    }

}

public function getAnswers($questionid = false)
{   
    if ($questionid)
    {
        //pull answers from db for only this question
        $answersql = "SELECT text FROM answers where question_id = :id ORDER BY correct DESC";
        $stmt = $this->_db->prepare($answersql);
        $stmt->bindParam(':id', $questionid, \PDO::PARAM_INT);
        $stmt->execute();
        while ($result = $stmt->fetchObject())
        {
           array_push($this->_answers,$result->text);
        }
    }
    else
    {
        //pull all answers from db grouped by question
        $answersql = "SELECT group_concat( a.text ORDER BY a.correct DESC SEPARATOR '~' ) FROM answers a GROUP BY a.question_id";
        $stmt = $this->_db->query($answersql);
        $stmt->execute();
        $resultset = $stmt->fetchAll(\PDO::FETCH_NUM);

        foreach ($resultset as $csv)
        {   
            $tmparray = explode('~', $csv[0]);
            array_push($this->_answers,$tmparray);
        }
    }

    return $this->_answers;
}


public function getQuestion($questionid) 
{
    $questionsql = "select text from questions where id = :id order by rand()";
    $stmt = $this->_db->prepare($questionsql);
    $stmt->bindParam(':id', $questionid, \PDO::PARAM_INT);
    $stmt->execute();
    $row = $stmt->fetchObject();
    $this->_question = $row->text;

    return $this->_question;
}

public function getQuestions()
{
    return $this->_questions;
}

private function _populateQuestions() 
{
    $questionsql = "select text from questions order by id asc";
    $stmt = $this->_db->query($questionsql);
    $stmt->execute();
    while ($row = $stmt->fetchObject())
    {
        $this->_questions[] .= $row->text;
    }
}

Answer 1

随机化一个与问题和答案数组长度相同的数组，将值作为数组索引，然后迭代测验问题和答案并更改其键。每个订单都是相同的。这是一个例子：

$order = [1, 0];

$ques = ['foo', 'bar'];

$ans = ['baz', 'bop'];

$new_ques = [];
$new_ans = [];
foreach($order as $k=>$v){
    $new_ques[$v] = $ques[$k];
    $new_ans[$v] = $ans[$k];
}
ksort($new_ques);ksort($new_ans);

var_dump($new_ques, $new_ans);

这样效率稍低，因为它会创建一个新数组来放置值，然后对它们进行排序，但它应该可以满足你的需要。

如何使用数据库中的相应答案随机化问题

1 个答案: