How to get current post user id

Question

I have some posts, each post have different authors(users).
I save each author image avatar in user_meta table.
Now i want show each author avatar in self posts. i get user_id with wp_get_current_user() function. but it work when user is logged in, i want when user not logged in get user id and show user avatar

Here my code

first way show user post avatar to all post not work $current_user = $post->post_author;

  <?php if (!empty(get_user_meta($current_user, 'user_avatar', true))): ?>
                        <img src="<?php echo get_user_meta($current_user, 'user_avatar', true); ?>" alt="some text">

Second way work, but whene user is logged in

$current_user = wp_get_currebt_user();

  <?php if (!empty(get_user_meta($current_user->ID, 'user_avatar', true))): ?>
                        <img src="<?php echo get_user_meta($current_user->ID, 'user_avatar', true); ?>" alt="some text">

Answer 1

To show author avatar per post inside loop you need to modify a little:

$current_post_author_id = get_the_author_meta( 'ID' );
<?php if (!empty(get_user_meta($current_post_author_id, 'user_avatar', true))): ?>
<img src="<?php echo get_user_meta($current_post_author_id, 'user_avatar', true); ?>" alt="some text">

Try, if it works for you.