I want to append text to the end of a file, but I can't seem to do it.

The following code doesn't work; the file is unchanged.
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$fp = fopen($filename, "rw");
$pos=fseek($fp,5);
print($pos);  # prints out 0, which is correct
$pos=ftell($fp);
print($pos);  # prints out 5, which is correct

$error = fwrite($fp, "hello"); # does nothing
$error = fclose($fp);
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The following code overwrites the file completely.
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$fp = fopen($filename, "w");
$error = fclose($fp);
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Anyone know of a workaround?

Thanks,

--Zeba Kimmel, z-kimmel@uiuc.edu