How to show top authors with avatar and count

<?php
//sort users descending by number of posts, display username and avatar
$uc=array();
$blogusers = get_users_of_blog();
if ($blogusers) {
  foreach ($blogusers as $bloguser) {
    $post_count = get_usernumposts($bloguser->user_id);
    $uc[$bloguser->user_id]=$post_count;
  }
  arsort($uc);
  foreach ($uc as $key => $value) {
    $user = get_userdata($key);
    $author_posts_url = get_author_posts_url($key);
    $post_count = $value;
    echo '<p>User ID ' . $user->ID . ' ' . $user->user_firstname . ' ' . $user->user_lastname . ' number of posts:' . $post_count . ' author posts url:' . $author_posts_url .'<p>';
    echo get_avatar( $user->ID, 46 );

  }
}
?>

Thanks a lot but it has error.

Notice: Undefined property: stdClass::$user_firstname in C:\xampplite\htdocs\wp\wp-content\themes\xxxxxxx\sidebar.php on line 31

the line is:

echo '<p>User ID ' . $user->ID . ' ' . $user->user_firstname . ' ' . $user->user_lastname . ' number of posts:' . $post_count . ' author posts url:' . $author_posts_url .'<p>';

Edit: i found the problem. from user_firstname and user_lastname doesn’t working. when i deleted it’s working but without names not ok.

<?php
//sort users descending by number of posts, display username and avatar
$uc=array();
$blogusers = get_users_of_blog();
if ($blogusers) {
  foreach ($blogusers as $bloguser) {
    $post_count = get_usernumposts($bloguser->user_id);
    $uc[$bloguser->user_id]=$post_count;
  }
  arsort($uc);
  foreach ($uc as $key => $value) {
    $user = get_userdata($key);
    $author_posts_url = get_author_posts_url($key);
    $post_count = $value;
 echo '<li>';
 echo '<a href="' . $author_posts_url .'">' . $user->user_nicename . '</a> (' . $post_count . ')';
 echo get_avatar( $user->ID, 4 );
 echo '</li>';
  }
}
?>

thats working.

finally i need to show 5 or 10. thats coming too much almost all of members.

Try this..

<?php
global $wpdb;
$top_authors = $wpdb->get_results("
	SELECT u.ID, count(post_author) as posts FROM {$wpdb->posts} as p
	LEFT JOIN {$wpdb->users} as u ON p.post_author = u.ID
	WHERE p.post_status = 'publish'
	AND p.post_type = 'post'
	GROUP by p.post_author
	ORDER by posts DESC
	LIMIT 0,10
");
if( !empty( $top_authors ) )
foreach( $top_authors as $key => $author ) {
	echo '
	<a href="' . get_author_posts_url( $author->ID ) . '">' . get_the_author_meta( 'nickname' , $author->ID ) . ' (' . $author->posts . ') posts </a>
	<br />
	';
}
?>

@t31os_ Thank you but this is without avatars.

—

<?php
//sort users descending by number of posts, display username and avatar
$uc=array();
$blogusers = get_users_of_blog();
if ($blogusers) {
  foreach ($blogusers as $bloguser) {
    $post_count = get_usernumposts($bloguser->user_id);
    $uc[$bloguser->user_id]=$post_count;
  }
  arsort($uc);
  foreach ($uc as $key => $value) {
    $user = get_userdata($key);
    $author_posts_url = get_author_posts_url($key);
    $post_count = $value;
 echo '<li>';
 echo '<a href="' . $author_posts_url .'">' . $user->user_nicename . '</a> (' . $post_count . ')';
 echo get_avatar( $user->ID, 4 );
 echo '</li>';
  }
}
?>

This is nice code but i need to only 10 authors. this is unlimited. thanks all.

You could add avatars to what i provided before…

<?php
global $wpdb;
$top_authors = $wpdb->get_results("
	SELECT u.ID, count(post_author) as posts FROM {$wpdb->posts} as p
	LEFT JOIN {$wpdb->users} as u ON p.post_author = u.ID
	WHERE p.post_status = 'publish'
	AND p.post_type = 'post'
	GROUP by p.post_author
	ORDER by posts DESC
	LIMIT 0,10
");
if( !empty( $top_authors ) ) {
	echo '<ul>';
	foreach( $top_authors as $key => $author ) {
		echo '
		<li>
			<a href="' . get_author_posts_url( $author->ID ) . '">' . get_the_author_meta( 'user_nicename' , $author->ID ) . '</a>
			(' . $author->posts . ') ' . get_avatar( $author->ID , 4 ) . '
		</li>
		';
	}
	echo '</ul>';
}
?>