A simpler way of inserting a user into the database.
wp_update_user
Update a user in the database.
profile_update
Fires immediately after an existing user is updated.
wp_insert_user
Insert a user into the database.
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username_exists
Determines whether the given username exists.
update_user_option
Update user option with global blog capability.
get_user_option
Retrieve user option that can be either per Site or per Network.
get_attachment_template
Retrieve path of attachment template in current or parent template.
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wp_delete_category
Deletes one existing category.
in_the_loop
Determines whether the caller is in the Loop.
is_preview
Determines whether the query is for a post or page preview.
is_attachment
Determines whether the query is for an existing attachment page.
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wp_new_user_notification
Email login credentials to a newly-registered user.
is_user_logged_in
Determines whether the current visitor is a logged in user.
attachment_link
Filters the permalink for an attachment.
