wordpress get user by id

1<?php
2	$user_id = get_current_user_id();
3?>

1$current_user = wp_get_current_user();
2echo($current_user->user_login);

1function get_the_ID() { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
2    $post = get_post();
3    return ! empty( $post ) ? $post->ID : false;
4}
5

1echo get_the_ID();

1$user_obj = get_user_by('id', 1);