Question

例如，我有以下代码：

<?php
$query = mysqli_query($connect, "SELECT * FROM user_thoughts WHERE added_by='$user' ORDER BY id DESC");

while ($row = mysqli_fetch_array($query)) {
    $thought_id      = $row['id'];
    $message_content = $row['message'];
    $date_of_msg     = $row['post_details'];
    $thoughts_by     = $row['added_by'];
    $attachent       = $row['attachment'];
    $shared          = $row['shared'];

    // for each post a user has made, a new div will be echo's
    echo    "
            <div class='message_wrapper'>
                // all content here which displays the message and author.
                // consider this anchor link, and see $_GET approach below.
                <a href='/inc/del_post.php?id=$thought_id>'>Delete </a> 
                <div id='toggleComment$thought_id' class='new_comment'>
                    <form action='' method='post' enctype='multipart/form-data'>
                        <table>
                            <tr>
                                <td>
                                    <textarea id='txtarea' name='comment_msg' cols='80' maxlength='180' placeholder=' add your comment...'></textarea> 
                                </td>
                                <td>
                                    <input id='send' type='submit' name='send_comm' value='Share'/> 
                                </td>
                            </tr>
                         </table> 
                    </form>
                </div>
            </div>";
} // while loop closed
// sending comments to database 
$comment = htmlentities(trim(strip_tags(@$_POST['comment_msg'])));
$comment = mysqli_real_escape_string($connect, $comment);

// if button is pressed, do this...
if(isset($_POST['send_comm'])){
    if (!empty ($comment)){
        $insert_comment = mysqli_query ($connect, "INSERT INTO user_comments VALUES ('','$comment','$username','$user','0','$thought_id')");
        header ("Location: /profile_page/$user");
    } 
}
?>

之前，我在while循环中进行了'send_comm'处理，当我用来提交表单时，comment将被添加到所有用户帖子中。例如，Alice发了两个帖子，我给一个帖子添加了评论，两个帖子都会显示该消息（以及db中的两个新行）。

现在，为了解决上述问题，我在while循环之外放了'send_comm'处理，当然，这个$thought_id（在我的INSERT中）将是未定义的。此外，将它放在while循环之外，无法知道哪个thought_id被赋值。所以要解决这个问题，我尝试使用$_GET：

$thought_id_from_anchor = $_GET ['id'];

// if button is pressed, do this...
if(isset($_POST['send_comm'])){
    if (!empty ($comment)){
        $insert_comment = mysqli_query ($connect, "INSERT INTO user_comments VALUES ('','$comment','$username','$user','0','$thought_id_from_anchor')");
        header ("Location: /profile_page/$user");
    } 
}

但是，当然，因为它在while循环之外，我在id上得到一个未定义的错误。

我只需将评论添加到正在添加的$thought_id。

Answer 1

您只需在表单中添加hidden输入，其中包含$thought_id的值：

<form action='' method='post' enctype='multipart/form-data'>

    <input type='hidden' name='thought_id' value='$thought_id'>

    <table>
        <tr>
            <td>
                <textarea id='txtarea' name='comment_msg' cols='80' maxlength='180' placeholder=' add your comment...'></textarea> 
            </td>
            <td>
                <input id='send' type='submit' name='send_comm' value='Share'/> 
            </td>
        </tr>
     </table> 
</form>

然后，当提交表单时，您可以使用thought_id为您的查询访问$_POST的值（也清理了一下）：

// if button is pressed, do this...
if (isset($_POST['send_comm'])) {

    $_POST = array_map('trim', $_POST);

    if (!empty($_POST['thought_id']) &&
        !empty($_POST['comment_msg'])) {

        $comment = htmlentities(strip_tags($_POST['comment_msg']));
        $comment = mysqli_real_escape_string($connect, $comment);
        $thought_id = mysqli_real_escape_string($connect, $_POST['thought_id']);

        $insert_comment = mysqli_query ($connect, "INSERT INTO user_comments VALUES ('','$comment','$username','$user','0','$thought_id')");
        header ("Location: /profile_page/$user");
    }
    else {
        // empty fields; handle this accordingly
    }
}

Answer 2

INSERT INTO user_comments VALUES ('','$comment'

那个空字符串是什么？

我认为这是ID，因此，ID只接受整数值，您可以替换为null，或者将其删除。

INSERT INTO user_comments VALUES (null,'$comment'

INSERT INTO user_comments VALUES ('$comment'

Answer 3

如果你想使用循环的id out，你必须将它＆gt;分配给一个全局变量。你需要在全局范围中声明一个变量＆gt;然后在中使用global关键字while循环。一旦你这样做，你可以使用think_id变量任何你选择。

  

 <?php
    $query = mysqli_query($connect, "SELECT * FROM user_thoughts WHERE added_by='$user' ORDER BY id DESC");


$thought_id; // Declare the variable outside of the while loop in the global scope 



 while ($row = mysqli_fetch_array($query)) {


      global  $thought_id      = $row['id']; 
 /*use the global keyword to assign the the value of this variable to the global variable and you will be able to use it out side of the while loop */


        $message_content = $row['message'];
        $date_of_msg     = $row['post_details'];
        $thoughts_by     = $row['added_by'];
        $attachent       = $row['attachment'];
        $shared          = $row['shared'];

        // for each post a user has made, a new div will be echo's
        echo    "
                <div class='message_wrapper'>
                    // all content here which displays the message and author.
                    // consider this anchor link, and see $_GET approach below.
                    <a href='/inc/del_post.php?id=$thought_id>'>Delete </a> 
                    <div id='toggleComment$thought_id' class='new_comment'>
                        <form action='' method='post' enctype='multipart/form-data'>
                            <table>
                                <tr>
                                    <td>
                                        <textarea id='txtarea' name='comment_msg' cols='80' maxlength='180' placeholder=' add your comment...'></textarea> 
                                    </td>
                                    <td>
                                        <input id='send' type='submit' name='send_comm' value='Share'/> 
                                    </td>
                                </tr>
                             </table> 
                        </form>
                    </div>
                </div>";
    } // while loop closed
    // sending comments to database 
    $comment = htmlentities(trim(strip_tags(@$_POST['comment_msg'])));
    $comment = mysqli_real_escape_string($connect, $comment);

    // if button is pressed, do this...
    if(isset($_POST['send_comm'])){
        if (!empty ($comment)){
            $insert_comment = mysqli_query ($connect, "INSERT INTO user_comments VALUES ('','$comment','$username','$user','0','$thought_id')");
            header ("Location: /profile_page/$user");
        } 
    }
    ?>

在while循环之外使用$ _GET，其中定义了['']

3 个答案: