Mysql 测验布局改进
我要做一个简单的测验。 我不想在一页纸上打印出所有问题,格式良好的布局如下: 问题1Mysql 测验布局改进,mysql,sorting,Mysql,Sorting,我要做一个简单的测验。 我不想在一页纸上打印出所有问题,格式良好的布局如下: 问题1 答案1 答案2 问题2 答案1 答案2 我目前正在编写以下代码: $get_qa = $mysqli->query(" SELECT a.question AS question, a.id AS qid, b.answer AS answer, b.qid AS aqid (related to: question id) FROM rw_questions a LEFT
答案1
答案2
问题2
答案1
答案2
我目前正在编写以下代码:
$get_qa = $mysqli->query("
SELECT
a.question AS question,
a.id AS qid,
b.answer AS answer,
b.qid AS aqid (related to: question id)
FROM rw_questions a
LEFT OUTER JOIN rw_qanswers b ON a.id = b.qid");
while($qa = $getqa->fetch_assoc()){
echo $qa['question'].$qa['answer'];
}
这将导致一个混乱的列表。但我该如何改进这一点,比如我在顶部写的东西?
任何帮助都很酷!
我想我需要用foreach或类似的东西来改进它?构建两个阵列,其中一个是二维阵列 比如: 保存在如下数组中:
$questions[1] = "sky has color?";
$answers[1][0] = "blue";
$answers[1][1] = "red";
$questions[2] = "what is?";
$answers[2][0] = "answer 1";
php:
然后循环它:
// Loop $questions array
foreach ($questions as $qid => $question) {
echo "<p>Question: " . $quesion . "</p>";
// Loop $answers[questionId] array
foreach ($answers[$qid] as $answer) {
echo $answer . "<br />";
}
}
//循环$questions数组
foreach($qid=>$QUOTE的问题){
回声“问题:“.$quesion.””;
//循环$answers[questionId]数组
foreach($answers[$qid]作为$answer){
echo$answer.“
”;
}
}
这个答案可以改进,但应该会起作用,给你一个良好的开端。这实际上回答了我的问题:
我是舒尔Danfrom德国的解决方案成功了,如果我有时间稍微调整一下的话:)非常感谢您的回答。但是,当我尝试您的代码时,没有打印任何内容。在没有深入解释的情况下,对代码进行错误跟踪有点困难:P您知道那里可能有什么问题吗?:)增加了解释和注释。似乎我还是无法让这个代码正常工作。非常感谢你的评论,这帮了大忙。它仍然没有打印出任何内容:/code>执行此操作时会发生什么:
while($qa=$getqa->fetch_assoc()){print_r($qa);}
如果我尝试打印$qa变量,它将返回一个包含问题的数组,每个问题只有一个答案:)
$questions = array();
$answers = array();
// Take every row
while($qa = $getqa->fetch_assoc()) {
// Add questions
// $question[1] = "sky has color?";
$question[$qa['qid']] = $qa['question'];
// If no answers have been set yet, init an array
if (!is_array($answers[$qa['qid']]) {
$answers[$qa['qid']] = array();
}
// Add answers
// $answers[1][] = "blue";
// $answers[1][] = "red";
$answers[$qa['qid']][] = $qa['answer'];
}
// Loop $questions array
foreach ($questions as $qid => $question) {
echo "<p>Question: " . $quesion . "</p>";
// Loop $answers[questionId] array
foreach ($answers[$qid] as $answer) {
echo $answer . "<br />";
}
}