Filters whether the provided username is valid or not.
username_exists
Filters whether the given username exists or not.
clean_user_cache
Fires immediately after the given user’s cache is cleaned.
user_{$field}
Filters the value of a user field in a standard context.
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pre_user_{$field}
Filters the value of a user field in the ‘db’ context.
edit_user_{$field}
Filters a user field value in the ‘edit’ context.
wp_dropdown_users
Filters the wp_dropdown_users() HTML output.
wp_dropdown_users_args
Filters the query arguments for the list of users in the dropdown.
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pre_count_users
Filter the user count before queries are run. Return a non-null value to cause count_users() to return early.
get_blogs_of_user
Filters the list of sites a user belongs to.
pre_get_blogs_of_user
Filters the list of a user’s sites before it is populated.
get_user_option_{$option}
Filters a specific user option value.
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get_usernumposts
Filters the number of posts a user has written.
check_is_user_spammed
Filters whether the user has been marked as a spammer.
wp_authenticate_user
This filter is documented in wp-includes/user.php