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Question

如何移动以适应数组中的问题的答案或如何使SQL查询获得所需的效果？这几天我厌倦了这种遗憾。

<?php 
    public function getQuestions() 
    { 
     $sql = 'SELECT * FROM questions'; 
     $result = Database::query($sql); 
     while ($row = mysql_fetch_assoc($result)) { 
      $questions[] = $row; 
     } 
     return $questions; 
    } 

    public function getAnswers($qid) 
    { 
     $sql = 'SELECT idq, answer, truth FROM answers WHERE idq = '.$qid; 
     $result = Database::query($sql); 
     while ($row = mysql_fetch_assoc($result)) 
     { 
      $answers[] = $row; 
     } 
     return $answers; 
    } 

    public static function array_add($a1, $a2) 
    { 
     $aRes = $a1; 
     foreach (array_slice(func_get_args(), 1) as $aRay) 
     { 
      foreach (array_intersect_key($aRay, $aRes) as $key => $val) $aRes[$key] += $val; 
      $aRes += $aRay; 
     } 
     return $aRes; 
    } 


    public static function getQuiz() 
    { 
     $db = new Database(); 
     self::$questions = $db->getQuestions(); 
     foreach(self::$questions as $q) 
     { 
      $qid = $q['qid']; 

      self::$answers[$qid] = $db->getAnswers($qid); 
     } 

     $s = Quiz::array_add(self::$questions, self::$answers); 
     print "<pre>"; 
     print_r($s); 
     print "</pre>"; 
    } 
?> 

输出：

Array 
(
    [0] => Array 
     (
      [qid] => 1 
      [question] => Bunty szlachty pod has?ami obrony praw nazywamy? 
     ) 

    [1] => Array 
     (
      [qid] => 2 
      [question] => Kto dowodzi? wojskami kozackimi podczas powstania Chmielnickiego? 
      [0] => Array 
       (
        [idq] => 1 
        [answer] => liberum veto 
        [truth] => 1 
       ) 

      [1] => Array 
       (
        [idq] => 1 
        [answer] => jurydyki 
        [truth] => 0 
       ) 

      [2] => Array 
       (
        [idq] => 1 
        [answer] => rokosze 
        [truth] => 0 
       ) 

     ) 

    [2] => Array 
     (
      [qid] => 3 
      [question] => W którym roku odby?a si?, morska, bitwa pod Oliw?? 
      [0] => Array 
       (
        [idq] => 2 
        [answer] => Bohdan Chmielnicki 
        [truth] => 1 
       ) 

      [1] => Array 
       (
        [idq] => 2 
        [answer] => Gustaw II Adolf 
        [truth] => 0 
       ) 

      [2] => Array 
       (
        [idq] => 2 
        [answer] => Iwan IV Gro?ny 
        [truth] => 0 
       ) 

     ) 

    [3] => Array 
     (
      [0] => Array 
       (
        [idq] => 3 
        [answer] => 1627 
        [truth] => 1 
       ) 

      [1] => Array 
       (
        [idq] => 3 
        [answer] => 1608 
        [truth] => 0 
       ) 

      [2] => Array 
       (
        [idq] => 3 
        [answer] => 1654 
        [truth] => 0 
       ) 

     ) 

) 

我试过这个解决方案，但是我需要分别有答案：

function get_quiz() 
{ 
    $sql = 'SELECT question, GROUP_CONCAT(answer ORDER BY answer SEPARAtoR " ") as answers 
      FROM questions 
      LEFT JOIN answers ON (questions.qid=answers.idq) 
      GROUP BY answers.idq;'; 
    $result = mysql_query($sql); 
    while ($row = mysql_fetch_assoc($result)) 
    { 
     $quiz[] = $row; 
    } 
    return $quiz; 
} 

输出：

Array 
(
    [0] => Array 
     (
      [question] => Bunty szlachty pod has?ami obrony praw nazywamy? 
      [answers] => jurydyki liberum veto rokosze 
     ) 

    [1] => Array 
     (
      [question] => Kto dowodzi? wojskami kozackimi podczas powstania Chmielnickiego? 
      [answers] => Bohdan Chmielnicki Gustaw II Adolf Iwan IV Gro?ny 
     ) 

    [2] => Array 
     (
      [question] => W którym roku odby?a si?, morska, bitwa pod Oliw?? 
      [answers] => 1608 1627 1654 
     ) 

) 

Answer 1

的问题是这条线：

 self::$answers[$qid] = $db->getAnswers($qid); 

与ID的问题“1”正被放入该数组的第0个位置，以便所有的答案将最终关闭的1

一个潜在的解决方法是改变：

foreach(self::$questions as $q) 
    { 
     $qid = $q['qid']; 
     self::$answers[$qid] = $db->getAnswers($qid); 
    } 

到：

foreach(self::$questions as $idx=>$q) 
    { 
     $qid = $q['qid']; 
     self::$answers[$idx] = $db->getAnswers($qid); 
    }