WP_User::remove_role() WordPress Method

	public function remove_role( $role ) {
		if ( ! in_array( $role, $this->roles, true ) ) {
			return;
		}

		unset( $this->caps[ $role ] );
		update_user_meta( $this->ID, $this->cap_key, $this->caps );
		$this->get_role_caps();
		$this->update_user_level_from_caps();

		/**
		 * Fires immediately after a role as been removed from a user.
		 *
		 * @since 4.3.0
		 *
		 * @param int    $user_id The user ID.
		 * @param string $role    The removed role.
		 */
		do_action( 'remove_user_role', $this->ID, $role );
	}
Uses	Description
wp-includes/class-wp-user.php:remove_user_role	Fires immediately after a role as been removed from a user.
wp-includes/class-wp-user.php:WP_User::update_user_level_from_caps()	Updates the maximum user level for the user.
wp-includes/class-wp-user.php:WP_User::get_role_caps()	Retrieves all of the capabilities of the user’s roles, and merges them with individual user capabilities.
wp-includes/plugin.php:do_action()	Calls the callback functions that have been added to an action hook.
wp-includes/user.php:update_user_meta()	Updates user meta field based on user ID.