Why Does "function endElement($parser, $name)" Do This?

This is kind of strange.
I open a stream called $fh with name, say, "maria", before the
function below, and then I try to write into the file "maria" to no
avail! I keep getting the error:

"fwrite(): supplied argument is not a valid stream resource in ... ".

We can't use a stream to write into inside endElement?

Here is the function

function endElement($parser, $name) {
global $insideitem, $tag, $title, $description, $link;
if ($name == "ITEM") {
fwrite($fh,$title);
printf("<dt><b><a
href='%s'>%s</a></b></dt>",trim($link),htmlspecialchars(trim($title)));
printf("<dd>%s</dd>",htmlspecialchars(trim($description)));
$title = "";
$description = "";
$link = "";
$insideitem = false;
}
}

It is part of a PHP-program that reads RSS files and saves them with
certain format added. Everything else works fine.
This piece of code is not mine.
Please help!

maria
.

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