php

If you’ve updated WordPress, you should have noticed that wordpress goes into “maintenance mode” whenever mass plugins or WordPress itself is updated.  What if you wanted to do some manual upgrading?  Then you can manually put wordpress into maintenance mode.

To put wordpress into maintenance mode, just add a .maintenance file (notice the leading dot) in the same folder that contains wp-settings.php.  Then in the file add this:

<?php $upgrading = time(); ?>

When you’re done with your maintenance simply remove the .maintenance file.

source:

http://sivel.net/2009/06/wordpress-maintenance-mode-without-a-plugin/

There’s also a way to update what the maintenance page displays.  The default is a white page with a brief message.

http://xtremelysocial.com/2010/how-to-make-an-awesome-maintenance-mode-screen-for-wordpress/

There’s a great post on how to get WordPress to use your own template and override the default template.

The basic code looks like this;

function my_template() {
if (is_category() && get_query_var(‘cat’) == get_cat_id(‘fun’)) {
include (TEMPLATEPATH . ‘/category-fun.php’);
exit;
}
}

add_action(‘template_redirect’, ‘my_template’);

Be sure to use STYLESHEETPATH instead of his TEMPLATEPATH so that child themes respond to the code properly.

http://www.mihaivalentin.com/wordpress-tutorial-load-the-template-you-want-with-template_redirect/

Problem

In WordPress, I created a new WP_Query with a few simple args to get a custom post type.  However, no results came back.  I could look at the query by checking WP_Query’s request property.  The query, when run in mysql returned the desired rows.  So what was happening to these rows?

Solution

WP_Query’s posts property holds all the posts that will be returned.  Looking into wp-includes/query.php, it turned out that I didn’t have read permissions.  I was trying to show private posts.  The user needed ‘read_post’ and ‘read_private_posts’ permissions (‘post’ can be replaced with your custom capability).

On a side note, tax_query does not work in the args if you are retrieving a single post object.  What determines this?  It depends on what args  you send WP_Query.  If you send it args like ‘name’, ‘p’, ‘page_id’, and some other parameters it will mark it as is_single and it will not perform tax_query!  This took me a while to find.