Functions.php
function top_comment_authors($amount = 5){

global $wpdb;

$results = $wpdb->get_results('
SELECT
COUNT(comment_author_email) AS comments_count, comment_author_email, comment_author, comment_author_url
FROM
'.$wpdb->comments.'
WHERE
comment_author_email != "" AND comment_type = "" AND comment_approved = 1
GROUP BY
comment_author_email
ORDER BY
comments_count DESC, comment_author ASC
LIMIT '.$amount

);

$output = "
    ";
    foreach($results as $result){
    $output .= "
  • ".$result->comment_author."
    • ";
    }
    $output .= "
";

echo $output;

}

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