websocket.php

<?php
$host = '0.0.0.0'; //host
$port = '2003'; //port
$null = NULL; //null var

//Create TCP/IP sream socket
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
//reuseable port
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, 1);

//bind socket to specified host
socket_bind($socket, 0, $port);

//listen to port
socket_listen($socket);

//create & add listning socket to the list
$clients = array($socket);

//start endless loop, so that our script doesn't stop
while (true) {
	//manage multipal connections
	$changed = $clients;
	//returns the socket resources in $changed array
	socket_select($changed, $null, $null, 0, 10);

	//check for new socket
	if (in_array($socket, $changed)) {
		$socket_new = socket_accept($socket); //accpet new socket
		$clients[] = $socket_new; //add socket to client array

		$header = socket_read($socket_new, 1024); //read data sent by the socket
		perform_handshaking($header, $socket_new, $host, $port); //perform websocket handshake

		socket_getpeername($socket_new, $ip); //get ip address of connected socket
		$response = mask(json_encode(array('type' => 'system', 'message' => $ip . ' connected'))); //prepare json data
		send_message($response); //notify all users about new connection

		//make room for new socket
		$found_socket = array_search($socket, $changed);
		unset($changed[$found_socket]);
	}

	//loop through all connected sockets
	foreach ($changed as $changed_socket) {
		$bytes = socket_recv($changed_socket, $buf, 1024, 0);
		//check for any incomming data
		while ($bytes >= 1) {
			$received_text = unmask($buf); //unmask data
			$tst_msg = json_decode($received_text, true); //json decode 
			$type = $tst_msg['type']; //message text
			$msg = $tst_msg['message']; //message text

			//prepare data to be sent to client
			$response_text = mask(json_encode(array('type' => $type, 'message' => $msg)));
			send_message($response_text); //send data
			break 2; //exist this loop
		}

		$buf = @socket_read($changed_socket, 1024, PHP_NORMAL_READ);
		if ($buf === false) { // check disconnected client
			// remove client for $clients array
			$found_socket = array_search($changed_socket, $clients);
			socket_getpeername($changed_socket, $ip);
			unset($clients[$found_socket]);

			//notify all users about disconnected connection
			$response = mask(json_encode(array('type' => 'system', 'message' => $ip . ' disconnected')));
			send_message($response);
		}
	}
}
// close the listening socket
socket_close($socket);

function send_message($msg)
{
	global $clients;
	foreach ($clients as $changed_socket) {
		@socket_write($changed_socket, $msg, strlen($msg));
	}
	return true;
}


//Unmask incoming framed message
function unmask($text)
{
	$length = ord($text[1]) & 127;
	if ($length == 126) {
		$masks = substr($text, 4, 4);
		$data = substr($text, 8);
	} elseif ($length == 127) {
		$masks = substr($text, 10, 4);
		$data = substr($text, 14);
	} else {
		$masks = substr($text, 2, 4);
		$data = substr($text, 6);
	}
	$text = "";
	for ($i = 0; $i < strlen($data); ++$i) {
		$text .= $data[$i] ^ $masks[$i % 4];
	}
	return $text;
}

//Encode message for transfer to client.
function mask($text)
{
	$b1 = 0x80 | (0x1 & 0x0f);
	$length = strlen($text);

	if ($length <= 125)
		$header = pack('CC', $b1, $length);
	elseif ($length > 125 && $length < 65536)
		$header = pack('CCn', $b1, 126, $length);
	elseif ($length >= 65536)
		$header = pack('CCNN', $b1, 127, $length);
	return $header . $text;
}

//handshake new client.
function perform_handshaking($receved_header, $client_conn, $host, $port)
{
	$headers = array();
	$lines = preg_split("/\r\n/", $receved_header);
	foreach ($lines as $line) {
		$line = chop($line);
		if (preg_match('/\A(\S+): (.*)\z/', $line, $matches)) {
			$headers[$matches[1]] = $matches[2];
		}
	}

	$secKey = $headers['Sec-WebSocket-Key'];
	$secAccept = base64_encode(pack('H*', sha1($secKey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
	//hand shaking header
	$upgrade  = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
		"Upgrade: websocket\r\n" .
		"Connection: Upgrade\r\n" .
		"WebSocket-Origin: $host\r\n" .
		"WebSocket-Location: ws://$host:$port/demo/shout.php\r\n" .
		"Sec-WebSocket-Accept:$secAccept\r\n\r\n";
	socket_write($client_conn, $upgrade, strlen($upgrade));
}