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function SendUDP($host, $port, $buff, $waitAckSec=0)
{
$result = FALSE;
$socket = ($result=@socket_create(AF_INET, SOCK_DGRAM, SOL_UDP));
if ($socket)
{
$result = @socket_sendto($socket, $buff, strlen($buff), 0, $host, $port);
if ( $waitAckSec>0 )
{
$result = FALSE;
$read = array($socket);
$write = NULL;
$except = NULL;
if ( @socket_select($read, $write, $except, $waitAckSec) > 0 )
{
$fromHost = '';
$fromPort = 0;
@socket_recvfrom($socket, $result, 3, 0, $fromHost, $fromPort);
}
}
@socket_close($socket);
}
return $result;
}
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