Use of Global Variable When Exporting / Downloading Content

Within an 'if' statement, I'm defining a variable that I'd like to be global. When I then export to text file for download, I'd like to use that variable to define the filename.

Not sure how to get this to work. Any assistance would be appreciated.

Here is some excerpt from what I currently have:

if( isset($_REQUEST['action']) && ( strval($_REQUEST['action']) == 'export') )      {
      header("Content-Type: application/txt");
      header("Content-Disposition: attachment; filename=$nameOfFile.xls");

if( $action != "export") {
      global $nameOfFile = "test.txt");
      ?><a href='?action=export'>Export</a><?php

if( $action == "export") {
      echo "This is just a test";
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What do you mean, are you trying to maintain unique filenames?
YOu can either store it in a database or use session.

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