How can I tell if an output stream is finished?

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I have a page that resizes an image to be included in a html page, using:

echo "<img src=\"$rel_mapfile\"  alt=\"Course Map\">\n";

unlink($rel_mapfile);

I need the other html stuff on the page so I need to fetch a file from the server to include in the page.

So, I resized the image and saved it as a file.  That works fine.

After sending the temporary resized file I want to delete it.

Obviously, an unlink($rel_mapfile) is executed before the echo "<img src=\"$rel_mapfile\" ... is finished.

Thanks....

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