multiple socket_read with multi clients in php - sockets

Question

i have a problem with socket connections
i need multiple socket read with several clients but i can connect several clients but only can one socket_read for client, if i add second socket_read, the program doesnt work
$sock = socket_create(AF_INET, SOCK_STREAM, 0);
$socket_bind($sock, $address , $port);
$socket_listen ($sock , 10)
while (true){
$read = array();
//first socket is the master socket
$read[0] = $sock;
//now add the existing client sockets
for ($i = 0; $i < $max_clients; $i++)
{
if($client_socks[$i] != null)
{
$read[$i+1] = $client_socks[$i];
}
}
//now call select - blocking call
if(socket_select($read , $write , $except , null) === false)
{
$errorcode = socket_last_error();
$errormsg = socket_strerror($errorcode);
die("Could not listen on socket : [$errorcode] $errormsg \n");
}
//if ready contains the master socket, then a new connection has come in
if (in_array($sock, $read))
{
for ($i = 0; $i < $max_clients; $i++)
{
if ($client_socks[$i] == null)
{
$client_socks[$i] = socket_accept($sock);
//display information about the client who is connected
if(socket_getsockname($client_socks[$i], $address, $port))
{
echo "Client $i : $port . \n";
}
//Send Welcome message to client
$msg = "Bienvenido cliente {$key[0]} \n\r";
$msg .= "1.-Crear Paleta\n\r";
$msg .= "2.-Ubicar Paleta\n\r";
$msg .= "exz.-Salir\n\r";
socket_write($client_socks[$i] , $msg);
break;
}
}
}
//check each client if they send any data
for ($i = 0; $i < $max_clients; $i++)
{
if (in_array($client_socks[$i] , $read))
{
if (false === ($input = socket_read($client_socks[$i],PHP_NORMA))) {
echo "socket_read() failed: reason: " . socket_strerror(socket_last_error($msgsock)) . "\n";
break 2;
}
echo "client $i : ";
echo "$input";
//send response to client
socket_write ($client_socks[$i], "client $i : ");
socket_write ($client_socks[$i], $input);
socket_write ($client_socks[$i], "\r");
$y++;
}
}
}