PHP和MySQL中的嵌套注释

Question

我在论坛上进行了搜索，但没有得到权威的答案。我想以这种方式实现嵌套的注释结构：

<ul>
    <li>This is the parent first comment!
        <ul>
            <li>This is the reply for the first parent comment!
                <ul>
                    <li>This is a reply for the first reply of the parent comment!</li>
                    <li>This is a third reply for the first parent comment!</li>
                </ul>
            </li>
            <li>This is another reply for first parent comment!</li>
        </ul>
    </li>
    <li>This is gonna be parent second comment!
        <ul>
            <li>This is a reply for the second comment!</li>
        </ul>
    </li>
    <li>This is fourth parent comment!</li>
</ul>

我的表的转储如下：

+----+------------------------------------------------------------+--------+
| id | text                                                       | parent |
+----+------------------------------------------------------------+--------+
|  1 | This is the parent first comment!                          |      0 |
|  2 | This is gonna be parent second comment!                    |      0 |
|  3 | This is the reply for the first parent comment!            |      1 |
|  4 | This is another reply for first parent comment!            |      1 |
|  5 | This is a reply for the first reply of the parent comment! |      3 |
|  6 | This is a reply for the second comment!                    |      2 |
|  7 | This is a third reply for the first parent comment!        |      3 |
|  8 | This is fourth parent comment!                             |      0 |
+----+------------------------------------------------------------+--------+

我知道如何使用mysql_query()和while()循环。PHP和MySQL的新手。请帮帮我。

Answer 1

我在博客文章中做了类似的事情。但是，我只是尝试了相同的数据。当您说 嵌套注释时 ，最好以这种方式使用 嵌套函数 ：

function getComments($parent)
{
    # Get the data from SQL.
    # Check if it has nested comments.
    if (hasComments())
        getComments($child); # $child is the ID of the current comment.
}

为此，我已将您的数据导入MySQL并尝试了以下操作：

<?php
    mysql_connect('localhost', 'root');
    mysql_select_db('nestedcomments');
    function getComments($parent)
    {
        $res = mysql_query("SELECT * FROM `nestcomm` WHERE `parent` = $parent");
        if (mysql_num_rows($res))
        {
            echo "<ul>\n";
            while (($dat = mysql_fetch_array($res)) !== false)
                echo "<li>", $dat["text"], getComments($dat["id"]), "</li>\n";
            echo "</ul>\n";
        }
        else
            echo ($parent === 0) ? 'No Comments!' : "";
    }
    getComments(0);
?>

就像我之前说过的那样，我使用了嵌套函数，并且正如您所问的那样，这种输出几乎是相同的（不带花括号）：

<ul>
<li>This is the parent first comment!<ul>
<li>This is the reply for the first parent comment!<ul>
<li>This is a reply for the first reply of the parent comment!</li>
<li>This is a third reply for the first parent comment!</li>
</ul>
</li>
<li>This is another reply for first parent comment!</li>
</ul>
</li>
<li>This is gonna be parent second comment!<ul>
<li>This is a reply for the second comment!</li>
</ul>
</li>
<li>This is fourth parent comment!</li>
</ul>

希望这会有所帮助。