delete_user_option example

function wpmu_create_user( $user_name, $password, $email ) {
    $user_name = preg_replace( '/\s+/', '', sanitize_user( $user_name, true ) );

    $user_id = wp_create_user( $user_name, $password, $email );
    if ( is_wp_error( $user_id ) ) {
        return false;
    }

    // Newly created users have no roles or caps until they are added to a blog.     delete_user_option( $user_id, 'capabilities' );
    delete_user_option( $user_id, 'user_level' );

    /** * Fires immediately after a new user is created. * * @since MU (3.0.0) * * @param int $user_id User ID. */
    do_action( 'wpmu_new_user', $user_id );