Research on Real-time Multi-person Collaborative Editor Technology Using PHP

In recent years, multi-person collaborative editors (collaborative editors) have attracted much attention. With the rapid development of web applications, real-time multi-person collaboration editors have become one of the more and more popular application scenarios. As a web-based technology, PHP is increasingly becoming the first choice for implementing real-time multi-person collaborative editors.

This article will study the technologies required to implement a real-time multi-person collaborative editor, and focus on the application implementation of PHP.

1. Technical principles and implementation

1. Real-time collaboration technology

Real-time collaboration means that multiple users can directly edit the same document at the same time, and can See other users' editing results in real time. Real-time collaboration is widely used in the Web field, such as online production of presentations, whiteboards, code editors, etc.

Real-time collaboration requires the use of Web Socket technology to achieve a long connection between the client and the server. The client connects to the server through Web Socket, and the server broadcasts the user's editing results to all online users, thereby achieving real-time multi-person collaboration. Currently, all major browsers support Web Socket technology.

2. Editor technology

Editor technology is the key to realizing a multi-person collaborative editor. Currently the most commonly used real-time multi-person collaboration editor is CodeMirror. CodeMirror is a lightweight code editor written in JavaScript that supports syntax highlighting and code completion functions in multiple programming languages ​​and is easy to expand and customize.

This article is also based on CodeMirror and introduces how to implement a real-time multi-person collaboration editor in PHP.

3. PHP Technology

PHP is an open source server-side scripting language widely used in web development. PHP supports interaction with databases such as MySQL, and has the advantages of data security and easy maintenance.

2. Implementation steps

1. CodeMirror basic settings

Reference the CSS and JavaScript files required by CodeMirror in the code, and define an editor container .

<link rel="stylesheet" href="codemirror.css">
<script src="codemirror.js"></script>
<script src="mode/javascript/javascript.js"></script>
<div id="editor"></div>

Next define a CodeMirror instance and set some basic parameters, such as language type and theme.

var myCodeMirror = CodeMirror(document.getElementById("editor"), {
  mode: "javascript",
  theme: "default",
  lineNumbers: true,
  tabSize: 2,
  indentUnit: 2
});

2. Real-time collaboration settings

Establish a long connection between the client and the server through Web Socket technology, and send CodeMirror editing events to the server. When the server receives the editing event, it broadcasts the modified text to all online users.

var websocket = new WebSocket("ws://example.com:8080"); //替换成实际的 Web Socket 服务地址
myCodeMirror.on("change", function() {
  //获取修改后的文本
  var text = myCodeMirror.getValue(); 
  //将文本发送到服务端
  websocket.send(text);
});
//服务端返回的文本更新到CodeMirror
websocket.onmessage = function(event) {
  myCodeMirror.setValue(event.data);
};

3. PHP implementation

Use PHP on the server side to implement a Web Socket server, and connect to this server in client JavaScript.

Web Socket server is implemented using the Ratchet library. Ratchet is an asynchronous Web Socket framework for PHP that implements efficient asynchronous support through ReactPHP. In Ratchet, you can take some simple steps to create a Web Socket server and handle requests when events occur.

use RatchetMessageComponentInterface;
use RatchetConnectionInterface;

class MyServer implements MessageComponentInterface {
  protected $clients;

  public function __construct() {
    $this->clients = new SplObjectStorage;
  }

  public function onOpen(ConnectionInterface $conn) {
    $this->clients->attach($conn);
  }

  public function onMessage(ConnectionInterface $from, $msg) {
    foreach ($this->clients as $client) {
      if ($from != $client) {
        $client->send($msg);
      }
    }
  }

  public function onClose(ConnectionInterface $conn) {
    $this->clients->detach($conn);
  }

  public function onError(ConnectionInterface $conn, Exception $e) {
    $conn->close();
  }
}

$server = new RatchetServerIoServer(
  new RatchetHttpHttpServer(
    new RatchetWebSocketWsServer(
      new MyServer()
    )
  ),
  8080 //端口号
);

$server->run();

4. Application Deployment

After completing the above code, deploy the PHP code to the Web server and start the Web Socket server.

3. Conclusion

This article introduces the technical principles and implementation methods required to implement a real-time multi-person collaborative editor, focusing on the application implementation of PHP.

A real-time multi-person collaboration editor is implemented by using PHP Web Socket server and CodeMirror editor. This editor can be widely used in team collaboration development, online education and other fields due to its easy project integration, convenient use and strong scalability.

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