為什么我的 PHP foreach 循環在 mysql 上插入了錯誤的值？

Question

我在 PHP 中的 foreach 循環插入了錯誤的值。 我有一個表格，它使用帶有 jquery 的 html 表單收集有關一本書的數據。 在我插入數組值的表中，這是我的表單代碼。

表單.php

include_once 'config/database.php';
include_once 'config/bookclass.php';

$database = new Database();
$db = $database->getConnection();

$book = new Book($db);

if($_POST){

      $book->book_title=$_POST['book_title'];
      $book->number_of_ page=$_POST['number_of_ page'];
      $book->genre=$_POST['genre'];
      $book->author=$_POST['author'];
      $book->type=$_POST['type'];
      $book->publication=$_POST['publication'];

      if($book->book()){
        echo "saved";
      }
      else{
      echo "not saved";
 }
 }

這是我用來插入數據的 bookclass.php 代碼

public function book(){

foreach($this-> book_title AS $this->key => $this->value) {

                  $query = "INSERT INTO

                    table_a 

                    SET
                    book_title=:book_title,
                    number_of_ page = :number_of_page,
                    genre = :genre,
                    author = :author,
                    type = :type,
                    publication = :publication";

                    $stmt = $this->conn->prepare($query);



                    $this->book_title=$this->value;
                    $this->number_of_ page= $this->number_of_ page[$this->key];
                    $this->genre = $this->genre[$this->key];
                    $this-> author= $this-> author[$this->key];
                    $this-> type= $this-> type[$this->key];
                    $this-> publication = $this->publication[$this->key];

                    $stmt->bindParam(':book_title', $this->book_title);
                    $stmt->bindParam(':number_of_ page', $this->number_of_ page);
                    $stmt->bindParam(':genre ', $this->genre );
                    $stmt->bindParam(':author', $this->author);
                    $stmt->bindParam(': type', $this-> type);
                    $stmt->bindParam(':publication', $this->publication);

                   $stmt->execute();
                  }

這是我在表中插入的數據。

 +-----------+---------------+-------+--------------+------------+-----------+
 | book_title|number_of_ page| genre | author       | type       |publication|
 +-----------+---------------+-------+--------------+------------+-----------+
 | carrie    |     199       | horror| stephen king | softcover  |   1974    |
 +-----------+---------------+-------+--------------+------------+-----------+
 | dune      |     412       | scifi | frank herbert| hardcover  |   1965    |

但這是后端的結果。

 +-----------+---------------+-------+--------------+------------+-----------+
 | book_title|number_of_ page| genre | author       | type       |publication|
 +-----------+---------------+-------+--------------+------------+-----------+
 | carrie    |     199       | horror| H            | softcover  |   1974    |
 +-----------+---------------+-------+--------------+------------+-----------+
 | dune      |     9         | o     | I            | o          |   9       |

我不確定是什么問題。 也許有人可以分享他們對此事的專家意見，我將不勝感激。 非常感謝您提前。

編輯：我能夠在第一行正確插入數據，這是現在的樣子。 第一行的作者是正確的，但在第二行的“I”上，它現在變成了“t”。

 +-----------+---------------+-------+--------------+------------+-----------+
 | book_title|number_of_ page| genre | author       | type       |publication|
 +-----------+---------------+-------+--------------+------------+-----------+
 | carrie    |     199       | horror| stephen king | softcover  |   1974    |
 +-----------+---------------+-------+--------------+------------+-----------+
 | dune      |     9         | o     | t            | o          |   9       |

附加編輯：

所以我在 form.php 中添加這些代碼

include_once 'config/database.php';
include_once 'config/bookclass.php';

$database = new Database();
$db = $database->getConnection();

$book = new Book($db);

if($_POST){

  $book->book_title=$_POST['book_title'];
  $book->number_of_ page=$_POST['number_of_ page'];
  $book->genre=$_POST['genre'];
  $book->author=$_POST['author'];
  $book->type=$_POST['type'];
  $book->publication=$_POST['publication'];

  if($book->book()){
        var_dump ($value);
        var_dump($book->number_of_ page[$key]);
        var_dump($book->genre[$key]);
        var_dump($book->author[$key]);
        var_dump($book->type[$key]);
        var_dump($book->publication[$key]);
  }
  else{
  echo "not saved";
}
}

這是我得到的：

Notice: Undefined variable: value in /var/www/html/library/form.php on line 106
NULL 
Notice: Undefined variable: key in /var/www/html/library/form.php on line 107

Notice: String offset cast occurred in /var/www/html/library/form.php on line 107
string(1) "9" 
Notice: Undefined variable: key in /var/www/html/library/form.php on line 108

Notice: String offset cast occurred in /var/www/html/library/form.php on line 108
string(1) "t" 
Notice: Undefined variable: key in /var/www/html/library/form.php on line 109

Notice: String offset cast occurred in /var/www/html/library/form.php on line 109
string(1) "o" 
Notice: Undefined variable: key in /var/www/html/library/form.php on line 110

Notice: String offset cast occurred in /var/www/html/library/form.php on line 110
string(1) "o" 
Notice: Undefined variable: key in /var/www/html/library/form.php on line 111

Notice: String offset cast occurred in /var/www/html/library/form.php on line 111
string(1) "9" 

Answer 1

為什么在foreach循環中使用類成員？ 你可以這樣做：

foreach ($this->book_title as $key => $value) 。

你也有很多圍繞$this->調用的空格。 您的代碼也是 XSS 可注入的，因為您沒有使用htmlspecialchars或htmlentities清理您的輸入。 但所有這些都放在一邊。 調試 PHP 代碼的最佳方式是使用var_dump 。 首先檢查$this->author通過執行var_dump($this->author) 。 不幸的是，我不能再告訴你了，因為你提供的代碼不完整，為了做出有效的判斷並為你提供所需的幫助，你需要提供分配給author類成員的部分。

您確定要插入數據庫的值是真正的數組而不是字符串嗎？ 從您的輸出來看，這些值看起來像字符串，否則您將不會只得到字符。

Answer 2

好的，我發布了一個答案，因為我終於破解了它，

我只是改變了這個：

public function book(){

foreach($this-> book_title AS $this->key => $this->value) {

              $query = "INSERT INTO

                table_a 

                SET
                book_title=:book_title,
                number_of_ page = :number_of_page,
                genre = :genre,
                author = :author,
                type = :type,
                publication = :publication";

                $stmt = $this->conn->prepare($query);

                $this->book_title=$this->value;
                $this->number_of_ page= $this->number_of_ page[$this->key];
                $this->genre = $this->genre[$this->key];
                $this-> author= $this-> author[$this->key];
                $this-> type= $this-> type[$this->key];
                $this-> publication = $this->publication[$this->key];

                $stmt->bindParam(':book_title', $this->book_title);
                $stmt->bindParam(':number_of_ page', $this->number_of_ page);
                $stmt->bindParam(':genre ', $this->genre );
                $stmt->bindParam(':author', $this->author);
                $stmt->bindParam(': type', $this-> type);
                $stmt->bindParam(':publication', $this->publication);

               $stmt->execute();
              }

對此：

              public function book(){

    foreach($this-> book_title AS $key => $value) {

              $query = "INSERT INTO

                table_a 

                SET
                book_title=:book_title,
                number_of_ page = :number_of_page,
                genre = :genre,
                author = :author,
                type = :type,
                publication = :publication";

                $stmt = $this->conn->prepare($query);

                $this->book_title=$value;
                $this->number_of_ page= $this->number_of_ page;
                $this->genre = $this->genre;
                $this-> author= $this-> author;
                $this-> type= $this-> type;
                $this-> publication = $this->publication;

                $stmt->bindParam(':book_title', $value);
                $stmt->bindParam(':number_of_ page', $this->number_of_ page[$key]);
                $stmt->bindParam(':genre ', $this->genre[$key] );
                $stmt->bindParam(':author', $this->author[$key]);
                $stmt->bindParam(': type', $this-> type[$key]);
                $stmt->bindParam(':publication', $this->publication[$key]);

               $stmt->execute();
              }