web socket PHP

gan tau gak erornya kenapa ni, di web socket.

 PHP Fatal error:  Call to undefined function socket_create() in C:\xampp5.6\htdocs\dashboardreal\websocket\class.PHPWebSocket.php on line 103

ini script servernya jika saya jalanin eror kayak diatas

 <?php
// prevent the server from timing out
set_time_limit(0);

// include the web sockets server script (the server is started at the far bottom of this file)
require 'class.PHPWebSocket.php';

// when a client sends data to the server
function wsOnMessage($clientID, $message, $messageLength, $binary) {
	global $Server;

	// check if message length is 0
	if ($messageLength == 0) {
		$Server->wsClose($clientID);
		return;
	}

	if ( sizeof($Server->wsClients) != 1 ) {
		//Send the message to everyone but the person who said it
		foreach ( $Server->wsClients as $id => $client ) {
			if ( $id != $clientID ) {
				$Server->wsSend($id, $message);
			}
		}
	}

}

// when a client connects
function wsOnOpen($clientID)
{
	global $Server;
	$ip = long2ip( $Server->wsClients[$clientID][6] );
	$Server->log( "$ip ($clientID) has connected." );
}

// when a client closes or lost connection
function wsOnClose($clientID, $status) {
	global $Server;
	$ip = long2ip( $Server->wsClients[$clientID][6] );
	$Server->log( "$ip ($clientID) has disconnected." );
}

// start the server
$Server = new PHPWebSocket();
$Server->bind('message', 'wsOnMessage');
$Server->bind('open', 'wsOnOpen');
$Server->bind('close', 'wsOnClose');
// for other computers to connect, you will probably need to change this to your LAN IP or external IP,
// alternatively use: gethostbyaddr(gethostbyname($_SERVER['SERVER_NAME']))
$Server->wsStartServer('127.0.0.1', 9300);

?>

ini class websocketnya

 function wsStartServer($host, $port) {
		if (isset($this->wsRead[0])) return false;

		if (!$this->wsRead[0] = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) {
			return false;
		}
		if (!socket_set_option($this->wsRead[0], SOL_SOCKET, SO_REUSEADDR, 1)) {
			socket_close($this->wsRead[0]);
			return false;
		}
		if (!socket_bind($this->wsRead[0], $host, $port)) {
			socket_close($this->wsRead[0]);
			return false;
		}
		if (!socket_listen($this->wsRead[0], 10)) {
			socket_close($this->wsRead[0]);
			return false;
		}

		$write = array();
		$except = array();

		$nextPingCheck = time() + 1;
		while (isset($this->wsRead[0])) {
			$changed = $this->wsRead;
			$result = socket_select($changed, $write, $except, 1);

			if ($result === false) {
				socket_close($this->wsRead[0]);
				return false;
			}
			elseif ($result > 0) {
				foreach ($changed as $clientID => $socket) {
					if ($clientID != 0) {
						// client socket changed
						$buffer = '';
						$bytes = @socket_recv($socket, $buffer, 4096, 0);

						if ($bytes === false) {
							// error on recv, remove client socket (will check to send close frame)
							$this->wsSendClientClose($clientID, self::WS_STATUS_PROTOCOL_ERROR);
						}
						elseif ($bytes > 0) {
							// process handshake or frame(s)
							if (!$this->wsProcessClient($clientID, $buffer, $bytes)) {
								$this->wsSendClientClose($clientID, self::WS_STATUS_PROTOCOL_ERROR);
							}
						}
						else {
							// 0 bytes received from client, meaning the client closed the TCP connection
							$this->wsRemoveClient($clientID);
						}
					}
					else {
						// listen socket changed
						$client = socket_accept($this->wsRead[0]);
						if ($client !== false) {
							// fetch client IP as integer
							$clientIP = '';
							$result = socket_getpeername($client, $clientIP);
							$clientIP = ip2long($clientIP);

							if ($result !== false && $this->wsClientCount < self::WS_MAX_CLIENTS && (!isset($this->wsClientIPCount[$clientIP]) || $this->wsClientIPCount[$clientIP] < self::WS_MAX_CLIENTS_PER_IP)) {
								$this->wsAddClient($client, $clientIP);
							}
							else {
								socket_close($client);
							}
						}
					}
				}
			}

			if (time() >= $nextPingCheck) {
				$this->wsCheckIdleClients();
				$nextPingCheck = time() + 1;
			}
		}

		return true; // returned when wsStopServer() is called
	}