php download header - Open With or Save As dialog

I have a working PHP script (details below) which correctly downloads a PDF file to the browser. However, I want the browser (Firefox for the moment) to prompt Open With or Save As. Currently, it just prompts me with 'Enter name of file to save to.'

How do I force the prompt?

//from www.zubrag.com/scripts/download.php
// remove some bad chars
$asfname = str_replace(array('"',"'",'\\','/'), '', $_GET['fc']);
if ($asfname === '') $asfname = $title; //filename

// set headers

ob_start();
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-Type: application/pdf");
header("Content-Disposition: attachment; filename=\"{$title}\"");
header("Content-Transfer-Encoding: binary");
header("Content-Length: " . $fsize);
ob_end_flush();

readfile($myFile);
exit;
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light-blueAsked:
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Ray PaseurCommented:
In the code snippet is a little script that I use to cause a download.  I am on FF 3.0.3.  When I run this script, I get a dialog box that gives me the choice to save the file or select a program to open the file.

HTH, ~Ray
<?php // RAY_force_download
 
function force_download($filename) {
	header("Content-Type: application/force-download");
	header("Content-Disposition: attachment; filename=\"$filename\"");
	header("Content-length: ".(string)(filesize($filename)));
	header("Expires: ".gmdate("D, d M Y H:i:s", mktime(date("H")+2, date("i"), date("s"), date("m"), date("d"), date("Y")))." GMT");
	header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");
	header("Cache-Control: no-cache, must-revalidate");
	header("Pragma: no-cache");
	echo file_get_contents($filename);
}
 
force_download("RAY_force_download.php");
 
?>

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light-blueAuthor Commented:
Hi Ray, I'm beginning to think this is not a PHP isssue since your script and mine work the same way on my setup. When I open open NON pdf files, it works as expected. In internet explorer, I get the proper dialog box too. I suspect this is related to my install of Adobe Acrobat 8 Pro. What happens with PDF's on your end with your code?
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Ray PaseurCommented:
I don't use my code for PDFs - I just put in a regular HTML anchor tag link.  If I left-click the PDF opens in the browser window (or a new window if <a target="_blank") and if I right-click I get the usual choices.
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