Research on real-time mobile office technology using PHP and Websocket

With the rapid development of mobile Internet, more and more people are paying attention to real-time mobile office technology. Information about employees in different geographical locations can be transmitted in real time through the Internet to assist them in online work and communication. Under this trend, developing a method of using PHP and Websocket to implement real-time mobile office technology has become a current trend.

This article will discuss how to use PHP and Websocket technology to achieve this real-time mobile office method. Websocket is a protocol that enables full-duplex communication over a single TCP connection. This protocol can establish a persistent connection between the client and the server, allowing the client to directly communicate with the server in real time through Websocket to update data in real time. By providing a server through PHP, this communication method can be implemented directly on the server.

In this communication process, the front-end communicates with PHP through Websocket. The client sends a request, and PHP transmits the request to the back-end database and returns the result to the client, realizing real-time information exchange between employees.

The following is the implementation process of this technology:

Step 1. Front-end initiates a request
The front-end uses a JavaScript program to initiate a request to establish a Websocket connection with the back-end.

let ws = new WebSocket("ws://your-domain.com:8080");

Step 2. Establish a connection
If the backend PHP successfully receives the request, send a successful connection signal.

header('HTTP/1.1 101 Switching Protocols');
header('Upgrade: websocket');
header('Connection: Upgrade');
header('Sec-WebSocket-Accept: ' . base64_encode(sha1($client_key . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true)));
echo 'connection success';

Here, $client_key is the encrypted string passed in the request to authenticate the request as a legitimate origin. This is an important step to prevent clients from forging requests.

Step 3. Request message
After the connection is established, a reply is established between the client and the backend. At this point, the client can send any request with message data to the backend. Through this request, PHP queries the database for data and returns the results to the client to achieve real-time data updates.

ws.onopen = function(e) {
    ws.send('Hello Server!');
};

The PHP code is as follows:

while(true) {
    $payload = $socket->read();
    // 如果类型为close，退出循环
    if($payload === false){
        return false;
    }
    
    ...
    // 具体逻辑处理
    ...
    
    $socket->write(json_encode(['msg' => 'success']));
}

Step 4. Message reply
When PHP queries the results, it will return the results to the client. Since the front-end JS program has listened to the Websocket response, whenever the back-end sends data, the front-end JS program can parse the data.

ws.onmessage = function(e) {
    console.log(e.data);
    let data = JSON.parse(e.data);
    // 前端操作数据
};

Therefore, when PHP returns data, the JS program can display the results on the front end to achieve real-time data exchange.

Summary:

Real-time mobile office technology is an important application of mobile Internet technology, aiming to achieve real-time communication and data exchange between employees. This article uses PHP and Websocket technology to implement an application that can request the server in real time to achieve the effect of updating data in real time. In the future mobile Internet era, using this technology to implement online mobile office methods will become more important and common.

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