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<?php
    public function fddAction()
    {
        // get attachment location
        $attachment_location = $_SERVER["DOCUMENT_ROOT"] . "/pdf/fdd/sample.pdf";
         
        if (file_exists($attachment_location)) {
            // attachment exists
             
            // send open pdf dialog to user
            header('Cache-Control: public'); // needed for i.e.
            header('Content-Type: application/pdf');
            header('Content-Disposition: inline; filename="sample.pdf"');
            readfile($attachment_location);
            die(); // stop execution of further script because we are only outputting the pdf
             
        } else {
            die('Error: File not found.');
        }
    }
?>