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.
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.
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())); }
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())); }
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())); }
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())); }
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 (!$buffer) { die("socket_recv() 失败: " . socket_strerror(socket_last_error())); }
In Once you are done with the network socket, you should close it.
Close client socket:
socket_close($client_socket);
Close server socket:
socket_close($socket);
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