note 56241 added to function.socket-select

A simple PHP script using socket_select() to manage multiple connections. connect using "telnet localhost 9050". it broadcasts your messages that you send through telnet to other users connected to the server -- sort of like a chat script #!/usr/local/bin/php <?php $port = 9050; // create a streaming socket, of type TCP/IP $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); // set the option to reuse the port socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1); // "bind" the socket to the address to "localhost", on port $port // so this means that all connections on this port are now our resposibility to send/recv data, disconnect, etc.. socket_bind($sock, 0, $port); // start listen for connections socket_listen($sock); // create a list of all the clients that will be connected to us.. // add the listening socket to this list $clients = array($sock); while (true) { // create a copy, so $clients doesn't get modified by socket_select() $read = $clients; // get a list of all the clients that have data to be read from // if there are no clients with data, go to next iteration if (socket_select($read, $write = NULL, $except = NULL, 0) < 1) continue; // check if there is a client trying to connect if (in_array($sock, $read)) { // accept the client, and add him to the $clients array $clients[] = $newsock = socket_accept($sock); // send the client a welcome message socket_write($newsock, "no noobs, but ill make an exception :)\n". "There are ".(count($clients) - 1)." client(s) connected to the server\n"); socket_getpeername($newsock, $ip); echo "New client connected: {$ip}\n"; // remove the listening socket from the clients-with-data array $key = array_search($sock, $read); unset($read[$key]); } // loop through all the clients that have data to read from foreach ($read as $read_sock) { // read until newline or 1024 bytes // socket_read while show errors when the client is disconnected, so silence the error messages $data = @socket_read($read_sock, 1024, PHP_NORMAL_READ); // check if the client is disconnected if ($data === false) { // remove client for $clients array $key = array_search($read_sock, $clients); unset($clients[$key]); echo "client disconnected.\n"; // continue to the next client to read from, if any continue; } // trim off the trailing/beginning white spaces $data = trim($data); // check if there is any data after trimming off the spaces if (!empty($data)) { // send this to all the clients in the $clients array (except the first one, which is a listening socket) foreach ($clients as $send_sock) { // if its the listening sock or the client that we got the message from, go to the next one in the list if ($send_sock == $sock || $send_sock == $read_sock) continue; // write the message to the client -- add a newline character to the end of the message socket_write($send_sock, $data."\n"); } // end of broadcast foreach } } // end of reading foreach } // close the listening socket socket_close($sock); ?> ---- Manual Page -- http://www.php.net/manual/en/function.socket-select.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+56241 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+56241&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+56241&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+56241&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+56241&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+56241&report=yes&reason=non-english Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+56241&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+56241&report=yes Search -- http://master.php.net/manage/user-notes.php