fputs / fpassthru and fclose errors, please help

I am getting these 3 errors in my php, can someone assist me please?

Code:

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fputs(): supplied argument is not a valid stream resource in /home/stream.php on line 37
[08-Sep-2012 14:39:53] PHP Warning:  fpassthru(): supplied argument is not a valid stream resource in /home/stream.php on line 39
[08-Sep-2012 14:39:53] PHP Warning:  fclose(): supplied argument is not a valid stream resource in /home/stream.php on line 41

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Stream.php

Code:

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<?php



        $url = urldecode($_GET["url"]);

        $tmp = parse_url($url);

        $streamname = $tmp["host"]; // put in whatever stream you want to play

        $port = (int)($tmp["port"]); // put in the port of the stream
        $path = $tmp["path"]; // put in any extra path, this is usually just a /
        if(empty($path)) $path = "/";
/*
                $fp = fopen("log.log","w");

        fwrite($fp,"$url\n");

fwrite($fp,$streamname."----------".$path."-------------".$port."\n");
        fclose($fp);*/

//        print $streamname."----------".$path."-------------".$port;

        header("Content-type: audio/mpeg");

        $sock = fsockopen($streamname,$port);

        fputs($sock, "GET $path HTTP/1.0\r\n");
        fputs($sock, "Host: $streamname\r\n");
        fputs($sock, "User-Agent: WinampMPEG/2.8\r\n");
        fputs($sock, "Accept: */*\r\n");
        fputs($sock, "Icy-MetaData:0\r\n");

        fputs($sock, "Connection: close\r\n\r\n");

        fpassthru($sock);

        fclose($sock);
?>

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Thank you.