File: wp-includes/ms-functions.php
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functionwpmu_validate_user_signup()
Sanitizes and validates data required for a user sign-up.
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Filters the subject of the new blog notification email.
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functionget_blog_post()
Gets a blog post from any site on the network.
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functionadd_user_to_blog()
Adds a user to a blog, along with specifying the user’s role.
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hookadd_user_to_blog
Fires immediately after a user is added to a site.
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functionremove_user_from_blog()
Removes a user from a blog.
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Fires before a user is removed from a site.
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functionget_blog_permalink()
Gets the permalink for a post on another blog.
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functionget_blog_id_from_url()
Gets a blog’s numeric ID from its URL.
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functionget_sitestats()
Gets the network’s site and user counts.
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functionget_active_blog_for_user()
Gets one of a user’s active blogs.
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functionget_blog_count()
Gets the number of active sites on the installation.