// Set the ip and port we will listen on
$address = 'localhost';
$port = 10000;
$max_clients = 10;

// Array that will hold client information
$client = Array();

// Create a TCP Stream socket
$sock = socket_create(AF_INET,SOCK_STREAM,0);
// Bind the socket to an address/port
socket_bind($sock,$address,$port) or die('Could not bind to address');
// Start listening for connections
socket_listen($sock);

echo "Waiting for connections...\r\n";

// Loop continuously
while (true) {
// Setup clients listen socket for reading
$read[0] = $sock;
for ($i = 0; $i < $max_clients; $i++) {
if (isset($client[$i]['sock']))
$read[$i + 1] = $client[$i]['sock'];
}
// Set up a blocking call to socket_select()
if (socket_select($read,$write = NULL,$except = NULL,$tv_sec = 5) < 1)
continue;
/ if a new connection is being made add it to the client array /
if (in_array($sock,$read)) {
for ($i = 0; $i < $max_clients; $i++) {
if (empty($client[$i]['sock'])) {
$client[$i]['sock'] = socket_accept($sock);
echo "New client connected $i\r\n";
break;
}
elseif ($i == $max_clients - 1)
echo "Too many clients...\r\n";
}
} // end if in_array

// If a client is trying to write - handle it now
for ($i = 0; $i < $max_clients; $i++) { // for each client
if (isset($client[$i]['sock'])) {
if (in_array($client[$i]['sock'],$read)) {
$input = socket_read($client[$i]['sock'],1024);
if ($input == null) {
echo "Client disconnecting $i\r\n";
// Zero length string meaning disconnected
unset($client[$i]);
} else {
echo "New input received $i\r\n";
// send it to the other clients
for ($j = 0; $j < $max_clients; $j++) {
if (isset($client[$j]['sock']) && $j != $i) {
echo "Writing '$input' to client $j\r\n";
socket_write($client[$j]['sock'],$input,strlen($input));
}
}
if ($input == 'exit') {
// requested disconnect
socket_close($client[$i]['sock']);
}
}
} else {
echo "Client disconnected $i\r\n";
// Close the socket
socket_close($client[$i]['sock']);
unset($client[$i]);
}
}
}
} // end while
// Close the master sockets
socket_close($sock);