php--如何编写一个简易的论坛

许俊风

2023-12-01

include3.php(数据库连接)

function doDB()
{
    global $conn3;

    $conn3 = mysqli_connect('localhost','root','','php_project01');
    if(mysqli_connect_errno())
    {
        echo "数据库连接失败！".mysqli_connect_error()."<br>";
        exit();
    }
}

addtopic.php(增加主题)

<html>
<head>
    <title>增加一个主题</title>
</head>
<body>
    <h1>增加一个主题</h1>
    <form method="post" action="to_addtopic.php">
        <p><label for="topic_owner">你的邮件地址:</label><br>
        <input type="email" id="topic_owner" name="topic_owner" size="40" maxlength="150"
 required="required"></p>

        <p><label for="topic_title">主题题目：</label><br>
        <input type="text" name="topic_title" id="topic_title" size="40" maxlength="150"
 required="required"></p>

        <p><label for="post_text">回复内容：</label><br>
        <textarea id="post_text" name="post_text" rows="8" cols="40"></textarea></p>

        <button type="submit" name="submit" value="submit">增加主题</button>
    </form>
</body>
</html>

toaddtopic.php(保存主题)

<?php
/**
 * Created by PhpStorm.
 */

include ('include3.php');
doDB();

if((!$_POST['topic_owner']) || (!$_POST['topic_title']) || (!$_POST['post_text']))
{
    header("Location:addtopic.php");
    exit;
}

$topic_owner = mysqli_real_escape_string($conn3,$_POST['topic_owner']);
$topic_title = mysqli_real_escape_string($conn3,$_POST['topic_title']);
$post_text = mysqli_real_escape_string($conn3,$_POST['post_text']);

$add_topic_sql = "insert into forum_topics(topic_title,topic_create_time,topic_owner)
    values('$topic_title',now(),'$topic_owner')";
$add_topic_result = mysqli_query($conn3,$add_topic_sql);

$topic_id = mysqli_insert_id($conn3);

$add_post_sql = "insert into forum_posts(topic_id,post_text,post_create_time,post_owner)
    values('$topic_id','$post_text',now(),'$topic_owner')";
$add_post_result = mysqli_query($conn3,$add_post_sql);

mysqli_close($conn3);

$display_block = "<p><strong>".$_POST['topic_title']."</strong>已创建成功！</p>";
?>
<html>
<head>
    <title>增加新主题</title>
</head>
<body>
    <h1>增加新主题</h1>
    <?php echo $display_block;?>
</body>
</html>

topiclist.php(论坛主题列表)

<?php
/**
 * Created by PhpStorm.
 */
include_once ('include3.php');
doDB();
$get_topics_sql = "select topic_id,topic_title, DATE_FORMAT(topic_create_time,'%b %e %Y at %r') AS 
        fmt_topic_create_time,topic_owner from forum_topics order by topic_create_time desc";
$get_topics_res = mysqli_query($conn3,$get_topics_sql) or die(mysqli_error($conn3));

if(mysqli_num_rows($get_topics_res) < 1)
{
    $display_block = "<p><strong>没有相应的主题存在！</strong></p>";
}
else
{
    $display_block = <<< END_OF_TEXT
    <table>
        <tr>
            <th>主题题目</th>
            <th>回复数</th>
        </tr>

END_OF_TEXT;

    while($topic_info = mysqli_fetch_array($get_topics_res))
    {
        $topic_id = $topic_info['topic_id'];
        $topic_title = stripslashes($topic_info['topic_title']);
        $topic_create_time = $topic_info['fmt_topic_create_time'];
        $topic_owner = stripslashes($topic_info['topic_owner']);

        $get_num_posts_sql = "select count(post_id) as post_count from forum_posts where topic_id=$topic_id";
        $get_num_posts_res = mysqli_query($conn3,$get_num_posts_sql) or die(mysqli_error($conn3));

        while($posts_info = mysqli_fetch_array($get_num_posts_res))
        {
            $num_posts = $posts_info['post_count'];
        }

        $display_block .= <<< END_OF_TEXT
        <tr>
            <td><a href="showtopic.php?topic_id=$topic_id"><strong>$topic_title</strong></a><br>
            由 $topic_owner 于 $topic_create_time 创建的。</td>
            <td class="num_posts_col">$num_posts</td>
        </tr>
END_OF_TEXT;

    }
    mysqli_free_result($get_topics_res);
    mysqli_free_result($get_num_posts_res);
    mysqli_close($conn3);
    $display_block .= "</table>";

}

?>

<html>
<head>
    <title>简易论坛</title>
    <style type="text/css">
        table
        {
            border: 1px solid black;
            border-collapse: collapse;
        }

        th
        {
            border: 1px solid black;
            padding: 6px;
            font-weight: bold;
            background-color: #cccccc;
        }
        td
        {
            border: 1px solid black;
            padding: 6px;
        }

        .num_posts_col
        {
            text-align: center;
        }
    </style>
</head>
<body>
    <h1>简易论坛</h1>
    <?php echo $display_block;?>
    <p>你也可以<a href="addtopic.php">新建一个主题</a>!</p>
</body>
</html>

showtopic.php(显示帖子)

<?php
/**
 * Created by PhpStorm.
 */

include ('include3.php');
doDB();

if(!isset($_GET['topic_id']))
{
    header("location:topiclist.php");
    exit;
}

$topic_id = mysqli_real_escape_string($conn3,$_GET['topic_id']);
$topic_sql = "select topic_title from forum_topics where topic_id = $topic_id";
$topic_res = mysqli_query($conn3,$topic_sql) or die(mysqli_error($conn3));

if(mysqli_num_rows($topic_res) < 1)
{
    $display_block = "<p><strong>你选择的主题题目已不存在，请<a href='topiclist.php'>重新选择</a>！</strong></p>";
}
else
{
    while($topic_info = mysqli_fetch_array($topic_res))
    {
        $topic_title = stripslashes($topic_info['topic_title']);
    }

    $get_posts_sql = "select post_id,post_text, DATE_FORMAT(post_create_time,'%b %e %Y %r') as fmt_post_create_time,
        post_owner from forum_posts where topic_id=$topic_id order by post_create_time asc";
    $get_post_res = mysqli_query($conn3,$get_posts_sql) or die(mysqli_error($conn3));

    $display_block = <<< END_OF_TEXT
    <p>关于<stron>[$topic_title]</stron>的相关回复内容如下:</p>
    <table >
        <tr>
            <th>回复</th>
            <th>内容</th>
        </tr>
    
END_OF_TEXT;

    while($posts_info = mysqli_fetch_array($get_post_res))
    {
        $post_id = $posts_info['post_id'];
        $post_text =nl2br(stripslashes($posts_info['post_text']));
        $post_create_time  = $posts_info['fmt_post_create_time'];
        $post_owner = stripslashes($posts_info['post_owner']);

        $display_block .= <<< END_TEXT
        <tr>
            <td>回复人：$post_owner<br><br>
            创建时间：$post_create_time</td>
            <td>$post_text<br><br>
            <a href="replytopost.php?post_id=$post_id"><strong>回复该帖</strong></a></td>
        </tr>
END_TEXT;

    }

    mysqli_free_result($get_post_res);
    mysqli_free_result($topic_res);
    mysqli_close($conn3);

    $display_block .= "</table>";
}

?>

<html>
<head>
    <title>查看帖子</title>
    <style type="text/css">
        table
        {
            border: 1px solid black;
            border-collapse: collapse;

        }

        th
        {
            border: 1px solid black;
            padding: 6px;
            font-weight: bold;
            background-color: #cccccc;
        }

        td
        {
            border: 1px solid black;
            padding: 6px;
            vertical-align: top;
        }


    </style>
</head>
<body>
    <h1>查看帖子</h1>
    <?php echo $display_block;?>
</body>
</html>

replytopost.php(回复帖子)

<?php
/**
 * Created by PhpStorm.
 */

include ('include3.php');
doDB();

if(!$_POST)
{
    if (!isset($_GET['post_id']))
    {

        header("location:topiclist.php");
        exit;
    }

    $post_id = mysqli_real_escape_string($conn3, $_GET['post_id']);
    $sql = "select ft.topic_id,ft.topic_title from forum_posts as fp LEFT JOIN forum_topics as ft ON fp.topic_id
      = ft.topic_id where fp.post_id=$post_id";

    $res = mysqli_query($conn3, $sql);

    if (mysqli_num_rows($res) < 1)
    {
        //header("location:topiclist.php");
        exit;
    }
    else
        {
        while ($topic_info = mysqli_fetch_array($res))
        {
            $topic_id = $topic_info['topic_id'];
            $topic_title = stripslashes($topic_info['topic_title']);
        }

        ?>

        <html>
        <head>
            <title>回复帖子</title>
        </head>
        <body>
        <h1>回复[<?php echo $topic_title; ?>]的帖子。</h1>
        <form method="post" action="<?php $_SERVER['PHP_SELF'] ?>">
            <p><label for="post_owner">邮箱地址：</label>
                <input type="email" id="post_owner" name="post_owner" size="40" maxlength="150" required="required"></p>
            <p><label>回复内容：</label>
                <textarea id="post_text" name="post_text" rows="8" cols="50" required="required"></textarea></p>
            <input type="hidden" name="topic_id" id="topic_id" value="<?php echo $topic_id; ?>">
            <button type="submit" name="submit" value="submit">提交回复</button>
        </form>
        </body>
        </html>

        <?php
    }

    mysqli_free_result($res);
    mysqli_close($conn3);
}
else if($_POST)
{
    if((!$_POST['topic_id']) || (!$_POST['post_text']) || (!$_POST['post_owner']))
    {
        header("location:topiclist.php");
        exit;
    }

    $topic_id = mysqli_real_escape_string($conn3,$_POST['topic_id']);
    $post_text = mysqli_real_escape_string($conn3,$_POST['post_text']);
    $post_owner = mysqli_real_escape_string($conn3,$_POST['post_owner']);

    $add_post_sql = "insert into forum_posts(topic_id,post_text,post_create_time,post_owner)
      values('$topic_id','$post_text',now(),'$post_owner')";

    $add_post_res = mysqli_query($conn3,$add_post_sql) or die(mysqli_error($conn3));

    mysqli_close($conn3);

    header("location:showtopic.php?topic_id=$topic_id");
    exit;
}

?>

数据库文件

-- phpMyAdmin SQL Dump
-- version 4.8.4
-- https://www.phpmyadmin.net/
--
-- 主机： 127.0.0.1
-- 生成日期： 2019-06-01 
-- 服务器版本： 10.1.37-MariaDB
-- PHP 版本： 7.3.1

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- 数据库： `php_project01`
--

-- --------------------------------------------------------

--
-- 表的结构 `forum_posts`
--

CREATE TABLE `forum_posts` (
  `post_id` int(11) NOT NULL,
  `topic_id` int(11) NOT NULL,
  `post_text` text,
  `post_create_time` datetime DEFAULT NULL,
  `post_owner` varchar(150) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

--
-- 转存表中的数据 `forum_posts`
--

INSERT INTO `forum_posts` (`post_id`, `topic_id`, `post_text`, `post_create_time`, `post_owner`) VALUES
(2, 2, 'I\'m interested in knowing how people got started in technology  -- did you thinker with household electronics? did you learn about it in school? did you parents buy you a computer and tell you to have at it.', '2019-06-01 09:09:38', 'jane@doe.com'),
(6, 4, '如题，这是一个简易的论坛，用于测试的。\r\n', '2019-06-01 17:00:46', 'abc@163.com'),
(7, 4, '这是一个测试的回复。', '2019-06-01 17:17:29', 'bat@baba.com');

-- --------------------------------------------------------

--
-- 表的结构 `forum_topics`
--

CREATE TABLE `forum_topics` (
  `topic_id` int(11) NOT NULL,
  `topic_title` varchar(150) DEFAULT NULL,
  `topic_create_time` datetime DEFAULT NULL,
  `topic_owner` varchar(150) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

--
-- 转存表中的数据 `forum_topics`
--

INSERT INTO `forum_topics` (`topic_id`, `topic_title`, `topic_create_time`, `topic_owner`) VALUES
(2, 'How did you get statrted with technology?', '2019-06-01 09:09:38', 'jane@doe.com'),
(4, '这是一个简易的论坛，用于测试。', '2019-06-01 17:00:46', 'abc@163.com');

--
-- 转储表的索引
--

--
-- 表的索引 `forum_posts`
--
ALTER TABLE `forum_posts`
  ADD PRIMARY KEY (`post_id`);

--
-- 表的索引 `forum_topics`
--
ALTER TABLE `forum_topics`
  ADD PRIMARY KEY (`topic_id`);

--
-- 在导出的表使用AUTO_INCREMENT
--

--
-- 使用表AUTO_INCREMENT `forum_posts`
--
ALTER TABLE `forum_posts`
  MODIFY `post_id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=8;

--
-- 使用表AUTO_INCREMENT `forum_topics`
--
ALTER TABLE `forum_topics`
  MODIFY `topic_id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=5;
COMMIT;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

php--如何编写一个简易的论坛

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