gzencode and stream http archive

function stream_gzencode($data) {
    $size = strlen($data);
    $crc = crc32($data);  
    $data = gzencode($data, 9);
    $data = substr($data, 0, -4);
    echo "\x1f\x8b\x08\x00\x00\x00\x00\x00";
    echo $data;
    echo pack('V', $crc);
    echo pack('V', $size);
}

stream_gzencode(file_get_contents('http://example.com/'));