What are the differences between PHP sockets on the server side and client-side sockets?

When working with PHP sockets, it's important to understand the differences between server-side and client-side sockets. Server-side sockets are used to listen for incoming connections and handle multiple client connections, while client-side sockets are used to initiate connections to a server. Server-side sockets typically use functions like socket_create(), socket_bind(), and socket_listen(), while client-side sockets use functions like socket_create(), socket_connect(), and socket_write().

// Server-side socket example
$serverSocket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_bind($serverSocket, '127.0.0.1', 8000);
socket_listen($serverSocket);

// Client-side socket example
$clientSocket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_connect($clientSocket, '127.0.0.1', 8000);
socket_write($clientSocket, "Hello, server!");