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событие не описано

profile_update хук-событие . WP 2.0.0

Fires immediately after an existing user is updated.

Использование

add_action( 'profile_update', 'action_function_name_8708', 10, 2 );
function action_function_name_8708( $user_id, $old_user_data ){
	// action...
}
$user_id(int)
User ID.
$old_user_data(object)
Object containing user's data prior to update.

Связи хука

Используется в: wp_insert_user()

Остальные хуки из: wp_insert_user():

Кусок кода с хуком

Фрагмент из: wp-includes/user.php WP 4.8.2
...
	} elseif ( ! $update ) {
		$user->set_role(get_option('default_role'));
	}
	wp_cache_delete( $user_id, 'users' );
	wp_cache_delete( $user_login, 'userlogins' );

	if ( $update ) {
		/**
		 * Fires immediately after an existing user is updated.
		 *
		 * @since 2.0.0
		 *
		 * @param int    $user_id       User ID.
		 * @param object $old_user_data Object containing user's data prior to update.
		 */
		do_action( 'profile_update', $user_id, $old_user_data );
	} else {
		/**
		 * Fires immediately after a new user is registered.
		 *
		 * @since 1.5.0
		 *
		 * @param int $user_id User ID.
		 */
		do_action( 'user_register', $user_id );
	}

	return $user_id;
}

/**
...