将数组插入数据库

Question

我使用此代码将问题与选项一起分组。

<?php 

$entries = preg_split('/(?=[a-z\d]+\.(?!\d))/', $str, -1, PREG_SPLIT_NO_EMPTY); 

    $questions = array(); 
    $currentQuestion = null; 
    $id = 0; 

    foreach($entries as $entry) { 
    if(is_numeric(substr($entry, 0, 1)) === true) { 
     $currentQuestion = $entry; 
     $questions[$entry] = array(); 
     $id++; 
     // echo "INSERT INTO question (id, q_name) VALUES ($id, $currentQuestion)"."<br>"; 
     // mysqli_query($con, "INSERT INTO question (id, q_name) VALUES (NULL, '$currentQuestion')"); 
     continue; 

    } 

    // mysqli_query($con, "INSERT INTO answers (id, choices, question, correct) VALUES (NULL, 'choices', $id , 0);"); 
    // echo "INSERT INTO answers (id, choices, question, correct) VALUES (NULL, 'choices', $id , 'stuff')"."<br>"; 
    $questions[$currentQuestion][] = $entry; 
    } 

这是数组的结果。

Array 
(
    [1. What is love?] => Array 
     (
      [0] => a. Haddaway 

      [1] => b. Haxxaway 

      [2] => c. Hassaway 

      [3] => d. Hannaway 

     ) 

    [2. What is love? ] => Array 
     (
      [0] => a. Haddaway 

      [1] => b. Haxxaway 

      [2] => c. Hassaway 

      [3] => d. Hannaway 

     ) 

    [3. What is love 1.1? ] => Array 
     (
      [0] => a. Haddaway 

      [1] => b. Haxxaway 

      [2] => c. Hassaway 

      [3] => d. Hannaway 

     ) 

    [4. What is love? ] => Array 
     (
      [0] => a. Haddaway 

      [1] => b. Haxxaway 

      [2] => c. Hassaway 

      [3] => d. Hannaway 
     ) 

) 

，这是我的数据库结构：表answersquestion列是从questions表的主键，这将决定哪些问题选择属于...

questions 
+-------+--------------------------+ 
| id | q_name     | 
+-------+--------------------------+ 
| 1 | 1.) What is foo?  | 
| 2 | 2.) What is foo?  | 
+-------+--------------------------+ 

answers 
+-------+-------------+-----------------------+ 
| id | choices  | question | correct | 
+-------+-------------+-----------------------+ 
| 1 | a. foo1 | 1   | 0  | 
| 2 | b. foo2 | 1   | 0  | 
| 3 | c. foo3 | 1   | 1  | 
| 4 | a. foo3 | 2   | 0  | 
| 5 | b. foo2 | 2   | 1  | 
| 6 | c. foo1 | 2   | 0  | 
+-------+-------------+-----------------------+ 

我设法插入问题db，但我有麻烦插入选择，因为我很困惑我应该怎么做$questions为了得到选择...

任何建议（S）会做！

Answer 1

我会不是使用json_encode()因为你正在建立一个规范化的数据结构。

下面是你需要做什么的细目;

• 插入问题纳入questions
• 抓住last_insert_id并将其存储在一个变量
• 使用last_insert_id

现在，请将答案为answers

链接的问题的答案到代码上。

收集数据

$arrAnswers = array(); 
$arrQuestions = array(); 
$id = 0; //Assuming your table is empty 

foreach($entries as $entry) { //Loop through the grabbed records 
    if(is_numeric(substr($entry, 0, 1)) === true) { //Is it a question? 
    $id++;  
    $arrAnswers[$id] = array(); 
    $arrQuestions[$id] = '(\''. $entry .'\')'; 
    } else { //Ok, it's a possible answer to a question 
    $arrAnswers[] = '(\''. $entry .'\', '. $id .', 0)'; 
    } 
} 

插入问题

现在我们有一个数组保存所有的答案的一个问题。数组键是数据库中的问题ID。我们现在可以通过干预来插入问题;

$strDbQuery = "INSERT INTO `questions` (`q_name`) VALUES ". implode(", ", $arrQuestions); 
// Execute the query. 

插入

现在你已经插入你的问题的答案，你现在可以将你的答案。

$strDbQuery = "INSERT INTO `answers` (`choices`, `question`, `correct`) VALUES ". implode(", ", $arrAnswers); 
// Execute the query. 

因为你的数组（不是你的问题）没有保存一个值来表明答案是否正确，你必须手动完成。

Answer 2

要存储数组，您需要将其作为字符串写入数据库。有两个（2）功能浮现在脑海：

serialize()serialize
json_encode()json_encode

要么伟大工程; serialize()将数组转换为一个字符串，然后您可以保存;稍后检索您的数组，将字符串传递给unserialize()函数。
json_encode()也具有伴随的json_decode()功能。要以数组形式读取数据[而不是此场景中的对象]，您必须这样做：
$questions = json_decode($string_from_database, true);

我希望这有助于。