WordPress MU

Not sure what's going on here, but clearly, restore_current_blog() is not working the way I had intended to use it. Based on what I've read in other functions in wpmu-functions.php, it should be a simple question of using switch_to_blog() to go mess with another blog, then restore_current_blog() should bring you back where you were. Sadly, that's not happening. Here's my code:

foreach ($blogs as $blog) {
        	if (!in_array($blog['blog_id'], $ignore)) {
        		switch_to_blog($blog['blog_id']);
        		$latest = $wpdb->get_row("SELECT * FROM $wpdb->posts WHERE post_type = 'post' AND post_date < NOW() ORDER BY post_date DESC", ARRAY_A);
        		$auth = $latest['post_author'];
        		$latest['post_author'] = $wpdb->get_var("SELECT user_email FROM <code>wp_users</code> WHERE ID = $auth");
        		$words = explode(' ', strip_tags($latest['post_content'], '<br>,<p>'));
        		$tease = '';
        		for($x=0; $x<80; $x++) {
        			$tease .= $words[$x].' ';
        		}
        		$latest['post_content'] = $tease;
        		$latest['post_link'] = get_blog_permalink($blog['blog_id'], $latest['post_id']);
        		if(function_exists(feature_art_gravatar)) { $latest['gravatar'] = feature_art_gravatar($latest['post_author'], 'PG', 80, 'http://dragonflyeye.net/allsorts/default_avatar_48.png'); }
        		$posts[] = $latest;
        	}
        }

It's definitely switching blogs with switch_to_blog just fine, but the switching back part isn't working. Also, for some reason, the get_blog_permalink function isn't working, either.

Anybody have any ideas?

Without looking at the code, restore_current_blog might actually restore the bog as active after a user has marked it deleted and an admin has undeleted it.

No, I'm sure of what it's supposed to do. Have a look at this function, directly out of the wpmu-functions.php file:

function add_blog_option( $id, $key, $value ) {
	switch_to_blog($id);
	add_option( $key, $value );
	restore_current_blog();
	$opt = $id."-".$key."-blog_option";
	wp_cache_set($opt, $value, 'site-options');
}

It certainly seems as though the point of the function is to first switch to a new blog, perform some task, then switch back to your current blog. Also, you can read the actual function at around line 380.

OK, I've figured this out.

For future reference to those of you who happen upon this question, the problem was not restore_current_blog(), but rather another function I was using, get_blog_permalink(). get_blog_permalink is designed to return the permalink of a post from another blog, thus it switches to that blog momentarily, runs get_permalink() and switches back. Thus it's not appropriate to use when I've already switched to that blog. Hence I got this in pseudocode:

start on blog 1
switch to blog 2
   get the latest article
   switch to blog 2
      get the permalink
   restore blog 2 (this is now the "restorable" blog)
restore blog 2
end on blog 2

So, a lesson to anyone trying to use the API's: take care to ensure you use those "remote" blog functions when you're working remotely from blog 1 and the "local" blog functions when you've switched to the blog 2.