Add method for XMl download

README.md

@@ -46,13 +46,8 @@ $payment->addTransaction($transaction);
 
 $sepa->addPayment($payment);
 
-header("Content-Type: text/xml");
-header("Content-Disposition: attachment; filename=\"sepa.xml\"");
-header("Pragma: no-cache");
-
 $xml = new \MG\Sepa\Xml($sepa);
-echo $
-xml->get();
+$xml->download('sepa.xml');
 ```
 
 ## Example of using SEPA Direct Debit
@@ -86,16 +81,12 @@ $payment->addTransaction($transaction);
 
 $sepa->addPayment($payment);
 
-header("Content-Type: text/xml");
-header("Content-Disposition: attachment; filename=\"sepa.xml\"");
-header("Pragma: no-cache");
-
 $xml = new \MG\Sepa\Xml($sepa);
-echo $xml->get();
+$xml->download('sepa.xml');
 ```
 
 ## External Resources
 
-* [German specification for remote data transfer between customer andbank according to the DFÜ agreement "Specification of Data Formats"](http://www.ebics.de/index.php?id=77)
+* [German specification for remote data transfer between customer and bank according to the DFÜ agreement "Specification of Data Formats"](http://www.ebics.de/index.php?id=77)
 * [ECB SEPA gateway page](http://www.ecb.europa.eu/paym/retpaym/html/index.en.html)
 * [ISO20022 Message Catalog](https://www.iso20022.org/full_catalogue.page)

src/lib/Sepa/Xml.php

@@ -1,5 +1,5 @@
 <?php
-// $Id: Xml.php 7657 2019-04-12 21:26:58Z markus $
+// $Id: Xml.php 7659 2019-04-12 22:45:54Z markus $
 declare(strict_types=1);
 
 namespace MG\Sepa;
@@ -144,6 +144,26 @@ public function save(string $filename) : bool
 		return true;
 	}
 
+	/**
+	 * download XML
+	 *
+	 * @param string $filename
+	 * @return void
+	 */
+	public function download(string $filename = '') : void
+	{
+		if (!$filename = trim($filename))
+		{
+			$filename = 'sepa.xml';
+		}
+		header('Content-Type: text/xml');
+		header('Content-Disposition: attachment; filename="' + $filename + '"');
+		header('Pragma: no-cache');
+
+		echo $this->get();
+		exit;
+	}
+
 	/**
 	 * generate the XML file
 	 *