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wp_count_sites

Count number of sites grouped by site status.

_update_blog_date_on_post_publish

Handler for updating the site’s last updated date when a post is published or an already published post is changed.

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get_last_updated

Get a list of most recently updated blogs.

update_archived

Update the ‘archived’ status of a particular blog.

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is_archived

Check if a particular blog is archived.

wp_switch_roles_and_user

Switches the initialized roles and current user capabilities to another site.

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switch_blog

This filter is documented in wp-includes/ms-blogs.php

switch_to_blog

Switch the current blog.