[2.x] Button Download Symfony2.7

Bonjour,
je veux un button qui me permts le telechargement d'un pdf .Mon probleme c'est le chemin (path) qui est statique .
Comment je pe le changer ? merci .

Code:

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  public function downloadAction($downloadfile) {
        ignore_user_abort(true);
        set_time_limit(0); // disable the time limit for this script
 
        $path = "C:\wamp\www\SystemeBM\web\download/"; // change the path to fit your websites document structure
        $dl_file = preg_replace("([^\w\s\d\-_~,;:\[\]\(\].]|[\.]{2,})", '', $downloadfile); // simple file name validation
        $dl_file = filter_var($dl_file, FILTER_SANITIZE_URL); // Remove (more) invalid characters
        $fullPath = $path . $dl_file;
 
        if ($fd = fopen($fullPath, "r")) {
            $fsize = filesize($fullPath);
            $path_parts = pathinfo($fullPath);
            $ext = strtolower($path_parts["extension"]);
            switch ($ext) {
                case "pdf":
                    header("Content-type: application/pdf");
                    header("Content-Disposition: attachment; filename=\"" . $path_parts["basename"] . "\""); // use 'attachment' to force a file download
                    break;
                // add more headers for other content types here
                default;
                    header("Content-type: application/octet-stream");
                    header("Content-Disposition: filename=\"" . $path_parts["basename"] . "\"");
                    break;
            }
            header("Content-length: $fsize");
            header("Cache-control: private"); //use this to open files directly
            while (!feof($fd)) {
                $buffer = fread($fd, 2048);
                echo $buffer;
            }
        }
        fclose($fd);
        exit;
    }