Php 对动态生成的表单实施验证码

我有一些功能可以生成我页面上的文章以及与之相关的评论：

function comment_form($id) { // generates a comment box form for every article on the page
    global $user_data;

    if (logged_in() === true) {
        echo "
        <form method='post' action='' class='comments_form'>
            <input type='text' name='username' placeholder='your name... *' id='name' value='{$user_data['username']}'>
            <div class='captcha'>" . create_captcha() .  "</div> 
            <textarea name='comments' id='textarea' placeholder='your comment... *' cols='30' rows='6'></textarea>
            <input type='hidden' name='blog_id' value='$id'>
            <input type='submit' name='submit' id='post' value='post'>
        </form>
        <hr class='artline'>";
    }
}

function list_articles($rows) { 
    if (empty($rows)) {
        return "There are no Articles to display";
    }

    $previous_blog_id = 0; 
    $content = '';

    foreach ($rows as $row) {
        if ($previous_blog_id != $row['content_id']) { // the blog id changed
            if ($previous_blog_id != 0) { // not the first section, close out the previous section
                $content .= comment_form($previous_blog_id); 
            }
            // start a new blog section
            $content .= "<h5 class='posted_by'>Posted by {$row['posted_by']} on {$row['date']}</h5>
                        <h1 class='content_headers'>{$row['title']}</h1>
                        <article>{$row['content']}</article>
                        <hr class='artline'>";
            $previous_blog_id = $row['content_id'];
        }
        if (!empty($row['comment_by']) && !empty($row['comments'])) {
             $content .= "<div class='commented_by'>User: {$row['comment_by']} </div>
                   <div class='comments'>Comment: {$row['comments']}</div>
                   <hr class='artline2'>";
        }
    }

    if ($previous_blog_id != 0) { 
        $content .= comment_form($previous_blog_id); 
    }

    return $content;
}

function insert_comments($comments, $comment_by, $blog_id) {
    include('core/db/db_connection.php');

    $comment_by = sanitize($comment_by);
    $comments = sanitize($comments);
    $blog_id = (int)$blog_id;
    $sql = "
        INSERT INTO article_comments (
               comments, 
               comment_by, 
               blog_id
        )
        VALUES (
              '$comments', 
              '$comment_by', 
              '$blog_id'
        )
    ";

    mysqli_query($dbCon, $sql);
}

我期望的行为是：

Article_1 title: LOREM IPSUM
Content: LOREM IPSUM DOLOR SIT AMET....
-------------------------------------- //comments
Name: User0
Comment: Great article!
--------------------------------------
Name: User1
Comment: Great article! - 2nd comment 
-------------------------------------- // end comments
|-------------------------------------| // comments form for article 1
|Name: New User                       |
|Comment: New comment !               |
|                                     | 
|-------------------------------------|
[Submit] [captcha field]

============================================================

Article_2 title: LOREM IPSUM
Content: LOREM IPSUM DOLOR SIT AMET....
-------------------------------------- //comments
Name: User0
Comment: Great article!
--------------------------------------
Name: User1
Comment: Great article! - 2nd comment 
-------------------------------------- // end comments
|-------------------------------------| // comments form for article 2
|Name: New User                       |
|Comment: New comment !               |
|                                     | 
|-------------------------------------|
[Submit] [captcha field]

这是否与我插入

generate\u captcha

函数的位置有关，该函数会导致注释框浮动在内容上方

编辑：如果我返回表单而不是回显表单，则此操作有效。评论表格位于相应文章下方：

function comment_form($id) {
    global $user_data;
    if (logged_in() === true) {
        return <<<EOT
        <form method='post' action='' class='comments_form'>
            <input type='text' name='username' placeholder='your name... *' id='name' value='{$user_data['username']}'>
            <textarea name='comments' id='textarea' placeholder='your comment... *' cols='30' rows='6'></textarea>
            <input type='hidden' name='blog_id' value='$id'>
            <input type='submit' name='submit' id='post' value='post'>
        </form>
        <hr class='artline'>
EOT;

---

如何返回create_blog_captcha的值？我显然做错了…

在函数create\u captcha（）中，您没有关闭隐藏的输入字段，因此中断了文档的整个流程

function create_captcha() {
    $num1 = generate_captcha(1, 20);
    $num2 = generate_captcha(1, 20);

    return $num1 . ' + ' . $num2 . ' = 
    <input type="text" name="captcha_results" size="2">
    <input type="hidden" name=\'num1\' value=' . $num1 . ' />
    <input type="hidden" name=\'num2\' value=' . $num2 . ' />';
}

函数创建\u验证码（）{
$num1=生成验证码（1,20）；
$num2=生成验证码（1,20）；
返回$num1.'+.$num2'=
';
}

---

正如您所注意到的，该函数以前会回显内容，而不是作为字符串返回到另一个输出html的函数。

您应该能够将这些框放置在您喜欢的位置-检查css！这些都是动态生成的，CSS仅为此进行了优化。当用户发布新文章时，将在该文章下方生成评论表单。如果我从注释表单中删除

create\u captcha

函数，我会得到预期的行为。所以我不认为这是一个css问题。我认为这与我将

create\u captcha

函数插入

comment\u表单

函数的方式有关，但我无法理解啊！我希望这会奏效，这似乎是正确的方法。然而，我仍然得到与以前完全相同的行为。注释框浮动在文章内容上方如果html流在源代码视图中看起来正确，那么我说如果隐藏字段现在正确关闭，这一定是css问题。我注意到，这个问题与我回显表单的事实有关。请看我更新的问题好发现。。。从create_captcha（）函数返回字符串

function comment_form($id) {
    global $user_data;
    if (logged_in() === true) {
        return <<<EOT
        <form method='post' action='' class='comments_form'>
            <input type='text' name='username' placeholder='your name... *' id='name' value='{$user_data['username']}'>
            <textarea name='comments' id='textarea' placeholder='your comment... *' cols='30' rows='6'></textarea>
            <input type='hidden' name='blog_id' value='$id'>
            <input type='submit' name='submit' id='post' value='post'>
        </form>
        <hr class='artline'>
EOT;

function comment_form($id, $captcha) { 
    global $user_data;
    if (logged_in() === true) {
        return <<<EOT
        <form method='post' action='' class='comments_form'>
            <input type='text' name='username' placeholder='your name... *' id='name' value='{$user_data['username']}'>
            <textarea name='comments' id='textarea' placeholder='your comment... *' cols='30' rows='6'></textarea>
            <input type='hidden' name='blog_id' value='$id'>
            <input type='submit' name='submit' id='post' value='post'>
        </form>
        <hr class='artline'>
EOT;
    }
}

function list_articles($rows) {
    if(empty($rows)){
        return "There are no Articles to display";
    }

    $create_blog_captcha = create_blog_captcha();
    $previous_blog_id = 0; 
    $content = '';

    foreach($rows as $row) {
        if ($previous_blog_id != $row['content_id']) { // the blog id changed
            if($previous_blog_id != 0) { // not the first section, close out the previous section
                $content .= comment_form($previous_blog_id, $create_blog_captcha); 
            }
            // start a new blog section
            $content .= "<h5 class='posted_by'>Posted by {$row['posted_by']} on {$row['date']}</h5>
                        <h1 class='content_headers'>{$row['title']}</h1>
                        <article>{$row['content']}</article>
                        <hr class='artline'>";
            $previous_blog_id = $row['content_id'];
        }
        if (!empty($row['comment_by']) && !empty($row['comments'])) {
             $content .= "<div class='commented_by'>User: {$row['comment_by']} </div>
                   <div class='comments'>Comment: {$row['comments']}</div>
                   <hr class='artline2'>";
        }
    }

    if($previous_blog_id != 0){ 
        $content .= comment_form($previous_blog_id, $create_blog_captcha); 
    }

    return $content;
}

function create_blog_captcha() { 
    $num1 = generate_captcha(1, 20);
    $num2 = generate_captcha(1, 20);
    $captchanum = $num1 . ' + ' . $num2 . ' = ';
    $captchanum .= '<input type="text" name="captcha_results" size="2">
                   <input type="hidden" name=\'num1\' value=' . $num1 . '>
                   <input type="hidden" name=\'num2\' value=' . $num2 . '>';
    return $captchanum;
}

function create_captcha() {
    $num1 = generate_captcha(1, 20);
    $num2 = generate_captcha(1, 20);

    return $num1 . ' + ' . $num2 . ' = 
    <input type="text" name="captcha_results" size="2">
    <input type="hidden" name=\'num1\' value=' . $num1 . ' />
    <input type="hidden" name=\'num2\' value=' . $num2 . ' />';
}