To understand Socket Programming(SP) you have to understand Network Communication fundamental first and I assume that you already read it. :)

Here’s a simple script for sending messages back and forth between a server and client. At this point, the code is fairly rough because once it enters the while loop, it doesn’t stop but it can be modified and fixed.(TCP/IP) Example.

The Server

error_reporting(E_ALL); $address = ""; $port = "10000"; $mysock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); socket_bind($mysock, $address, $port); socket_listen($mysock, 5); $client = socket_accept($mysock); echo "Server started, accepting connections...\n"; $i = 0; while (true == true) { $i++; echo "Sending $i to client.\n"; socket_write($client, $i, strlen($i)); $input = socket_read($client, 2048); echo "Response from client is: $input\n"; sleep(5); } echo "Closing sockets..."; socket_close($client); socket_close($mysock);

The Client

error_reporting(E_ALL); $address = ""; $port = 10000; $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if ($socket === false) { echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n"; } else { echo "socket successfully created.\n"; } echo "Attempting to connect to '$address' on port '$port'..."; $result = socket_connect($socket, $address, $port); if ($result === false) { echo "socket_connect() failed.\nReason: ($result) " . socket_strerror(socket_last_error($socket)) . "\n"; } else { echo "successfully connected to $address.\n"; }$i = 0; while (true == true) { $i++; echo "Sending $i to server.\n"; socket_write($socket, $i, strlen($i)); $input = socket_read($socket, 2048); echo "Response from server is: $input\n"; sleep(5); } echo "Closing socket..."; socket_close($socket);