如何将查询与 PHP 中的更改变量相关联

Question

我需要一点帮助。我试图找出如何将特定查询（删除记录）与记录的 id 相关联，而不是与另一个查询（记录的选择）回显的记录相关联。

这行代码在指定 id 时完全有效，但我再次需要它用于被调用的记录，如果我删除记录，id 可以跳过数字。

    $querytwo = "DELETE FROM `paginas` WHERE id = 5"; 

我的 phpmyadmin 数据库中有一个表，其中包含“id”、“pagetitle”、“toevoeging”（荷兰语中的添加）、“message”列。第一个是 INT，其余的是 varchars/text。

这可能是一个愚蠢的问题，我很抱歉。我对 PHP 和一般编程仍然很陌生。

这里是代码。我已经评论了行代码以澄清。谢谢！。

<?php 
        if (isset($_SESSION['email'])) //if the admin is active, forms can be written out.
        {
        echo '</nav>
          <br><br>  <div class="inlogscript">
         <form action="verstuurd.php" method="post">

            <input type="text" placeholder="Titel" method="POST" name="pagetitle" /><br><br>
            <input type="text" placeholder="Toevoeging" method="POST" name="toevoeging" /><br><br>
            <textarea class="pure-input-1-2" placeholder="Wat is er nieuws?" name="message"></textarea><br>
            <input type="submit" value="Bevestigen" />
        </form></div>'; 
        }       
        ?>  
    <div class="mainContent">

<?php

    include_once("config.php"); //this is the database connection
    $query = "SELECT * FROM paginas "; //selects from the table called paginas
    $result = mysqli_query($mysqli, $query);
        while($row = mysqli_fetch_assoc($result)) 
        {
        $pagetitle = $row['pagetitle'];
        $toevoeging = $row['toevoeging'];
        $message = $row['message'];

            echo '<article class="topcontent">' . '<div class="mct">' .  '<h2>' . "$pagetitle" .'</h2>' . '</div>' . "<br>" . 
            '<p class="post-info">'. "$toevoeging" . '</p>' .   '<p class="post-text">' . '<br>'. "$message" . '</p>' .'</article>' . '<div class="deleteknop">' . '<form method="post">
            <input name="delete" type="submit" value="Delete Now!">
            </form>' . '</div>' ;
        } //This long echo will call variables $pagetitle, $toevoeging and &message along with divs so they automatically CSS styled, 
         //along with a Delete button per echo that has the 3 variables

    $querytwo = "DELETE FROM `paginas` WHERE id = 5";  
    if (isset($_POST['delete'])) //Deletes the query if 'delete' button is clicked

        {
            $resulttwo = $mysqli->query($querytwo);  
        }

        ?>
            </div>
        </div>

这里还有记录的插入 INTO 查询。再次感谢！

$sql = "INSERT INTO paginas (pagetitle,toevoeging, message)
VALUES ('$_POST[pagetitle]','$_POST[toevoeging]','$_POST[message]')";
//the insertion into the table of the database

if ($MySQLi_CON->query($sql) === TRUE) {
    echo "";
} else {
    echo "Error: ". $sql . "" . $MySQLi_CON->error;
}

Answer 1

这还不够，但是，从你的 echo 开始：

echo '<article class="topcontent">
       <div class="mct">
        <h2>' . $pagetitle .'</h2>
       </div><br>
       <p class="post-info">'. $toevoeging . '</p>
       <p class="post-text"><br>'.$message.'</p>
      </article>
       <div class="deleteknop">
        <form method="post">';
         // you ll want to use $_POST["id"] array to delete :
   echo '<input type="hidden" name="id" value="'.$row['id'].'">
         <input name="delete" type="submit" value="Delete Now!">
        </form>
       </div>' ;