How to use PHP to develop a simple online document editor and multi-person collaboration function

How to use PHP to develop a simple online document editor and multi-person collaboration function

With the development of the Internet, more and more people are beginning to use online document editing servers to work collaboratively. This article will introduce how to use PHP language to develop a simple online document editor and implement multi-person collaboration function. We will provide specific code examples to help readers better understand and practice.

1. Basic function design

Our online document editor needs to have the following basic functions:

1. Creation and saving of documents: users can create new documents , and save it to the server.
2. Loading and display of documents: Users can load saved documents from the server and display them in the editor.
3. Editing and saving documents: Users can edit documents in the editor and save the changes to the server.
4. Multi-person collaboration: Multiple users can edit the same document at the same time and see other users’ edits in real time.

2. Technology Selection

In order to achieve the above functions, we will use the following technologies:

1. PHP: As a server-side development language, responsible for processing Document creation, saving and loading functions.
2. MySQL: As a database, used to store the content of documents and related information.
3. HTML, CSS and JavaScript: used to write the front-end interface and implement the interactive functions of the editor.

3. Specific code examples

1. Code to create a new document:

<?php
// 连接数据库
$conn = mysqli_connect("localhost", "username", "password", "database");

// 处理用户的请求
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // 获取文档内容
    $content = $_POST["content"];
    
    // 将文档内容保存到数据库
    $query = "INSERT INTO documents (content) VALUES ('$content')";
    mysqli_query($conn, $query);
    
    // 返回文档ID给用户
    $doc_id = mysqli_insert_id($conn);
    echo $doc_id;
}
?>

2. Code to load a saved document:

<?php
// 连接数据库
$conn = mysqli_connect("localhost", "username", "password", "database");

// 处理用户的请求
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // 获取文档ID
    $doc_id = $_POST["doc_id"];
    
    // 从数据库中获取文档内容
    $query = "SELECT content FROM documents WHERE id = $doc_id";
    $result = mysqli_query($conn, $query);
    $row = mysqli_fetch_assoc($result);
    $content = $row["content"];
    
    // 返回文档内容给用户
    echo $content;
}
?>

3. Code for editing and saving documents:

<?php
// 连接数据库
$conn = mysqli_connect("localhost", "username", "password", "database");

// 处理用户的请求
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // 获取文档ID和更新的内容
    $doc_id = $_POST["doc_id"];
    $content = $_POST["content"];
    
    // 更新数据库中的文档内容
    $query = "UPDATE documents SET content = '$content' WHERE id = $doc_id";
    mysqli_query($conn, $query);
}
?>

IV. Implementation of multi-person collaboration function

To achieve multi-person collaboration, you need to use WebSocket or Technologies such as polling, in this article we use polling to achieve simple multi-person collaboration.

1. Code to obtain other users’ editing content:

<?php
// 连接数据库
$conn = mysqli_connect("localhost", "username", "password", "database");

// 处理用户的请求
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // 获取文档ID和最新的更新时间
    $doc_id = $_POST["doc_id"];
    $last_update_time = $_POST["last_update_time"];
    
    // 查询数据库，获取其他用户的编辑内容
    $query = "SELECT content FROM documents WHERE id = $doc_id AND update_time > '$last_update_time'";
    $result = mysqli_query($conn, $query);
    $content = '';
    while($row = mysqli_fetch_assoc($result)) {
        $content .= $row["content"];
    }
    
    // 返回编辑内容给用户
    echo $content;
}
?>

2. Code to regularly poll other users’ editing content:

<script>
    // 轮询其他用户编辑内容的函数
    function pollForUpdates() {
        // 获取文档ID和最新的更新时间
        var doc_id = <?php echo $doc_id; ?>;
        var last_update_time = <?php echo time(); ?>;
        
        // 发送请求，获取其他用户的编辑内容
        $.post("get_updates.php", {doc_id: doc_id, last_update_time: last_update_time}, function(data){
            // 将编辑内容追加到编辑器中
            editor.appendText(data);
            
            // 递归调用函数，实现定时轮询
            pollForUpdates();
        });
    }
    
    // 初始化轮询函数
    pollForUpdates();
</script>

Through the above code example, we can implement a simple online document editor and realize the function of multi-person collaboration. Readers can modify and extend it according to their own needs. I hope this article can be helpful to readers in using online document editors and multi-person collaboration functions in PHP development.

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