| 
<?php
 include 'image_captcha.php';
 $img = new captcha();
 header('Content-type: audio/x-wav');
 header('Content-Disposition: attachment; name="captcha.wav"');
 header("Expires: Sun, 1 Jan 2000 12:00:00 GMT");
 header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
 header("Cache-Control: no-store, no-cache, must-revalidate");
 header("Cache-Control: post-check=0, pre-check=0", false);
 header("Pragma: no-cache");
 $img->audio();
 ?>
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