I wanted to stream a XML file directly to the user and having him prompted to save it without displaying the content, but when using
<?php
$out =new XMLWriter();
$out->openURI('php://output');
?>
the user's browser was displaying the file contents instead of prompting the user with a filesave window.
To have the XML file stream saved directly to the user without being displayed by the browser, you shoud add:
<?php
header("Content-Type: text/html/force-download");
header("Content-Disposition: attachment; filename='file_name.xml'");
$out =new XMLWriter();
$out->openURI('php://output');
?>
This will prompt the user with a dialog box to save 'file_name.xml' on his disk, and will not display the content of the streamed XML.