php--如何编写一个简易的论坛

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： 7.3.1SET 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 */;

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