如何用數據庫中的相應答案對問題進行隨機化

-1

我一直致力於製作測驗應用程序，並且我被困在一個點上。我使用PHP和MySQL來製作它。 所以，我現在想要從數據庫隨機抽取問題。但是，當我嘗試使用帶問題的rand（）時，它的選擇與它應該是不同的。 我應該怎麼做同步問題的隨機性與答案。如何用數據庫中的相應答案對問題進行隨機化

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; 
    } 
}

來源

2015-02-08 Shikher Aatrey

'從問題中選擇文本，其中id =：id order by rand（）'應該只檢索具有正在傳遞的'id'的問題。你確定他們不是正確的問題嗎？ – 2015-02-08 19:27:42

你是什麼意思？你能詳細說明嗎？ – 2015-02-08 19:33:03

隨機化相同的長度，你的問題和答案數組的數組，與值數組索引，然後遍歷問答題和答案，並改變他們的密鑰。每個訂單都是一樣的。這裏有一個例子：

$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);

這是稍微低效率的，因爲它創建了一個新的陣列穿上值，然後對其進行排序，但它應該對你所需要的工作。

來源

2015-02-08 19:32:12

如何用數據庫中的相應答案對問題進行隨機化

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