How to use PHP built-in functions for network programming?

This article explores the steps for network programming using PHP's built-in functions, including creating a socket, binding a socket, listening to a socket, accepting client connections, sending and receiving data, and closing the socket.

Using PHP built-in functions: Network Programming

PHP provides a series of built-in functions that allow you to easily perform network programming. This article explores practical examples of using these functions to create and use network sockets.

Create a network socket

socket_create() Function is used to create a network socket. It takes three parameters:

• $domain - the domain of the socket (e.g. AF_INET for IPv4)
• $type - The type of socket (e.g. SOCK_STREAM for TCP)
• $protocol - The protocol to use (for TCP, usually 0)

$socket = socket_create(AF_INET, SOCK_STREAM, 0);
if (!$socket) {
    die("socket_create() 失败: " . socket_strerror(socket_last_error()));
}

Bind network socket

socket_bind() Function Will the socket Bind to a specific address and port. You need to provide the following parameters:

• $socket - the socket to bind
• $address - the socket to bind to IP address
• $port - Port to bind

$address = "127.0.0.1";
$port = 8080;
if (!socket_bind($socket, $address, $port)) {
    die("socket_bind() 失败: " . socket_strerror(socket_last_error()));
}

Listening network socket

socket_listen () Function Set the socket to listening state. It requires supplying the following parameters:

• $socket - The socket to listen on
• $backlog - The maximum queued number in the queue Number of connections

$backlog = 5;
if (!socket_listen($socket, $backlog)) {
    die("socket_listen() 失败: " . socket_strerror(socket_last_error()));
}

Accept client connections

socket_accept() Function will block until the client connection arrives. It returns a new socket representing the connection.

$client_socket = socket_accept($socket);
if (!$client_socket) {
    die("socket_accept() 失败: " . socket_strerror(socket_last_error()));
}

Sending and receiving data

socket_send() and socket_recv() functions are used to send over sockets and receive data.

Send data:

$data = "Hello, client!";
if (!socket_send($client_socket, $data, strlen($data), 0)) {
    die("socket_send() 失败: " . socket_strerror(socket_last_error()));
}

Receive data:

$buffer = socket_recv($client_socket, 1024, 0);
if (!$buffer) {
    die("socket_recv() 失败: " . socket_strerror(socket_last_error()));
}

Close network socket

In Once you are done with the network socket, you should close it.

Close client socket:

socket_close($client_socket);

Close server socket:

socket_close($socket);

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