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//Èç¹û$waitAckSec´óÓÚ0£¬Ôò·µ»Ø·¢Ëͺó½ÓÊÕµ½µÄÄÚÈÝ
//ÈκÎÇé¿öÏ£¬Ê§°Ü¶¼·µ»ØFALSE
function SendUDP($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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