How to write a simple blog system through PHP

How to write a simple blog system through PHP

With the development of the Internet, blogs have become an important platform for individuals to share their ideas and experiences with the public. As a scripting language widely used on the server side, PHP can help us easily build a simple and practical blog system. This article will introduce how to write a simple blog system through PHP and provide specific code examples.

1. System requirements and architecture design

Before we start writing the blog system, we first need to clarify the system requirements and architecture design. A simple blog system should have the following functions:

• User registration and login: Allow users to register and log in to post blogs and comment on other blogs.
• Blog publishing and editing: allows users to publish new blogs and edit existing blog content.
• Blog list display: Display all blog lists on the homepage for users to view.
• Blog comment function: allows users to comment on other users’ blogs.

The system architecture design can adopt the MVC pattern (Model-View-Controller). Among them, the Model layer is responsible for data processing and storage; the View layer is responsible for page display and user interaction; and the Controller layer is responsible for processing user requests and page jumps.

2. Database design

Before writing a blog system, we need to design a database to store user information, blog content, comments and other data. The following is a simple database design example:

• User table (user):

  • User ID (id)
  • User name ( username)
  • Password (password)

• Blog table (blog):

  • Blog ID (id)
  • Title(title)
  • Content(content)
  • Publish time(create_time)
  • User ID(user_id)

• Comment table (comment):

  • Comment ID (id)
  • Comment content (content)
  • Comment time (create_time)
  • Blog ID (blog_id)
  • User ID (user_id)

##Write PHP code

connect_error) { die("连接失败: " . $conn->connect_error); } ?>

query($sql) === TRUE) { echo "注册成功"; } else { echo "注册失败: " . $conn->error; } } // 用户登录 if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST["login"])) { $username = $_POST["username"]; $password = $_POST["password"]; // 检查用户数据 $sql = "SELECT * FROM user WHERE username='$username' AND password='$password'"; $result = $conn->query($sql); if ($result->num_rows > 0) { echo "登录成功"; } else { echo "用户名或密码错误"; } } ?>

query($sql) === TRUE) { echo "发表成功"; } else { echo "发表失败: " . $conn->error; } } // 编辑博客 if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST["edit"])) { $blog_id = $_POST["blog_id"]; $title = $_POST["title"]; $content = $_POST["content"]; // 更新博客数据 $sql = "UPDATE blog SET title='$title', content='$content' WHERE id='$blog_id'"; if ($conn->query($sql) === TRUE) { echo "修改成功"; } else { echo "修改失败: " . $conn->error; } } ?>

query($sql); if ($result->num_rows > 0) { while($row = $result->fetch_assoc()) { echo "博客标题: " . $row["title"] . "
"; echo "博客内容: " . $row["content"] . "
"; echo "发布时间: " . $row["create_time"] . "
"; // 获取评论 $blog_id = $row["id"]; $comment_sql = "SELECT * FROM comment WHERE blog_id='$blog_id'"; $comment_result = $conn->query($comment_sql); if ($comment_result->num_rows > 0) { echo "评论列表: 
"; while($comment_row = $comment_result->fetch_assoc()) { echo "评论内容: " . $comment_row["content"] . "
"; echo "评论时间: " . $comment_row["create_time"] . "
"; } } else { echo "暂无评论
"; } echo "
"; } } else { echo "暂无博客"; } // 博客评论 if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST["comment"])) { $content = $_POST["content"]; $blog_id = $_POST["blog_id"]; $user_id = $current_user_id; // 假设当前登录用户的ID为$current_user_id // 插入评论数据 $sql = "INSERT INTO comment (content, blog_id, user_id) VALUES ('$content', '$blog_id', '$user_id')"; if ($conn->query($sql) === TRUE) { echo "评论成功"; } else { echo "评论失败: " . $conn->error; } } ?>

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