mattkatz/export_opml.php

## export_opml.php
<?php
// Set the headers so the file downloads
header('Content-type: application/xml+opml');
header('Content-Disposition: attachment; filename="Wordprss-OPML-Export.xml"');

//oh PHP.  Why you gotta be so difficult about escaping things?
echo "<?xml version=\"1.0\" encoding=\"utf-8\"?".">";
?>
<opml version="1.0" >
  <head>
    <dateCreated>
      <?php echo date("r", time())?>
    </dateCreated>
    <title>
      WordpRSS OPML Feed Export
    </title>
  </head>
  <body>
    <?php
    //this file requires $wpdb and the like.
    require_once 'backend.php';
    // this should take in a param.
    // the param should be a userid.
    // if the userid == current user, we export everything but private
    // otherwise, just export the public stuff.
    $feeds = WprssFeeds::get();
    foreach($feeds as $feed){
    ?>
      <outline text="<?php echo $feed->feed_name?>" title="<?php echo $feed->feed_name?>" type="rss" xmlUrl="<?php echo $feed->feed_url?>" htmlUrl="<?php echo $feed->site_url?>"/>
    <?php
    }
    ?>
  </body>
</opml>
<?php
exit;
?>


## plugin_main.php
//in the main plugin file
//We want to make a query variable called export_opml
add_filter('query_vars','plugin_add_trigger');
function plugin_add_trigger($vars) {
      $vars[] = 'export_opml';
          return $vars;
}

//and if we see that query variable, we include the file we want to send
add_action('template_redirect', 'plugin_trigger_check');
function plugin_trigger_check() {
  if(intval(get_query_var('export_opml')) == wp_get_current_user()->ID) {
    require_once 'export_opml.php';
    //exit, because we don't want to send any of the rest of WP - no menus, posts, etc.
    exit;
  }
}

## user_interface.php
<a href="<?echo site_url() ?>?export_opml=<?php echo wp_get_current_user()->ID ?>">Export OPML</a>
	<?php
	// Set the headers so the file downloads
	header('Content-type: application/xml+opml');
	header('Content-Disposition: attachment; filename="Wordprss-OPML-Export.xml"');

	//oh PHP. Why you gotta be so difficult about escaping things?
	echo "<?xml version=\"1.0\" encoding=\"utf-8\"?".">";
	?>
	<opml version="1.0" >
	<head>
	<dateCreated>
	<?php echo date("r", time())?>
	</dateCreated>
	<title>
	WordpRSS OPML Feed Export
	</title>
	</head>
	<body>
	<?php
	//this file requires $wpdb and the like.
	require_once 'backend.php';
	// this should take in a param.
	// the param should be a userid.
	// if the userid == current user, we export everything but private
	// otherwise, just export the public stuff.
	$feeds = WprssFeeds::get();
	foreach($feeds as $feed){
	?>
	<outline text="<?php echo $feed->feed_name?>" title="<?php echo $feed->feed_name?>" type="rss" xmlUrl="<?php echo $feed->feed_url?>" htmlUrl="<?php echo $feed->site_url?>"/>
	<?php
	}
	?>
	</body>
	</opml>
	<?php
	exit;
	?>
	//in the main plugin file
	//We want to make a query variable called export_opml
	add_filter('query_vars','plugin_add_trigger');
	function plugin_add_trigger($vars) {
	$vars[] = 'export_opml';
	return $vars;
	}

	//and if we see that query variable, we include the file we want to send
	add_action('template_redirect', 'plugin_trigger_check');
	function plugin_trigger_check() {
	if(intval(get_query_var('export_opml')) == wp_get_current_user()->ID) {
	require_once 'export_opml.php';
	//exit, because we don't want to send any of the rest of WP - no menus, posts, etc.
	exit;
	}
	}