Filters whether the provided username is valid or not.
validate_username
Checks whether a username is valid.
set_current_user
Fires after the current user is set.
set_current_user
Changes the current user by ID or name.
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update_option_{$option}
Fires after the value of a specific option has been successfully updated.
WP_Rewrite::flush_rules
Removes rewrite rules and then recreate rewrite rules.