function author_comment_count(){
	 
	    $oneText = '1';
	    $moreText = '%';
	 
	    global $wpdb;
	 
	    $result = $wpdb->get_var('
	        SELECT
	            COUNT(comment_ID)
	        FROM
	            '.$wpdb->comments.'
	        WHERE
	            comment_author_email = "'.get_comment_author_email().'"'
	    );
 
	    if($result == 1):
	 
	        echo str_replace('%', $result, $oneText);
	 
	    elseif($result > 1):
	 
	        echo str_replace('%', $result, $moreText);
	 
	    endif;
	 
	}



To display an author’s total number of comments, use the function like this inside of your comments loop :

	author_comment_count();

Display the number of comments by author

wordpress

PHP