<?php
$sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
if(!socket_bind($sock,0,$argv[1])){
	printMessage("Couldn't bind socket");
	exit;
}
socket_set_nonblock($sock);

$clients = array();

$clients = array($sock);

$c = array();
   
$wait=1; 

$users = array();

while (true) {
	usleep($wait);
    // create a copy, so $clients doesn't get modified by socket_select()
    $read = array($sock);
    $write = array();
    $except = NULL;
    $buf="";
    
    // 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, $except, 0) < 1){
        $wait = 100;
        continue;
     }
     $wait = 1;
	$from = '';
	$port = 0;
	socket_recvfrom($sock, $buf, 1024, 0, $from, $port);
	echo "Received $buf from remote address $from and remote port $port and got: " .$buf. PHP_EOL;

	$data = explode("|",trim($buf));
	switch($data[0]){
		case 1: 
			$users[count($users)] = array('ip' => $from, 'port'=>$port, 'name'=>$data[1]);
			break;
		case 2:
			for($i=0;$i<count($users);$i++){
				if($users[$i]['name']==$data[1]){
					$buf = $users[$i]['ip']."|".$users[$i]['port'];
					echo "Sending ".$buf.PHP_EOL;
					socket_sendto($sock, $buf, strlen($buf), 0, $from, $port);
					break;
				}
			} 
			
			break;
	}

}

// close the listening socket
socket_close($sock);