$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
socket_bind($socket, $ip_server , $port);
socket_sendto($socket, $ascii_egyben_kimenet, strlen($ascii_egyben_kimenet), 0, $ip_plc , $port);
$valasz_kimenet=socket_read($socket, 256);
Because the socket_read the server is waiting for an answer... How I can define the max time to wait?
You do that with the function socket_set_timeout(). Example for a 1/2 second timeout:
socket_set_timeout($socket, 0, 500);
You can check if someone is trying to connect without blocking by setting the socket to non-blocking mode:
socket_set_blocking($socket, 0);
Or
socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array('sec'=>10, 'usec'=>0));
I don't know if the same problem shows up with socket_set_timeout(), but with serious use of stream_set_timeout(), I found that PHP was setting the time limit at double what I specified. So if I told it 60 seconds, it actually was exactly two minutes before I stopped listening. I actually had to take the number of seconds desired and multiply by 500000 to get the value to use in stream_set_timeout().
