Exclude some authors from query

Question

This script list users with their last post. How to exclude some authors from guery ?

<?php

    //List of users sorted descending by date of lastest post written by user
    $uc=array();
    $blogusers = get_users_of_blog();

    if ($blogusers) 
    {
        foreach ($blogusers as $bloguser) 
        {
            $user = new WP_User( $bloguser->user_id );
            if ( !empty( $user->roles ) && is_array( $user->roles ) )
            {
                $userpost = get_posts('showposts=1&author='.$bloguser->user_id);
                $uc[$bloguser->user_id] = '';
                if ($userpost) 
                {
                    $uc[$bloguser->user_id]=$userpost[0]->post_date;
                }
            }
        }
        arsort($uc);
        $i = 0;
        foreach ($uc as $key => $value) 
        {
            $user = get_userdata($key);
            $post_count = count_user_posts($user->ID);
            if ($post_count && $i < 10) 
            {
                $author_posts_url = get_author_posts_url($key);

                //preparing query for titles
                $args=array(
                'author' => $user->ID ,
                'post_type' => 'post',
                'post_status' => 'publish',
                'posts_per_page' => 1,
                'ignore_sticky_posts'=> 1,
                );
                $my_query = null;
                $my_query = new WP_Query($args);

                if( $my_query->have_posts() ) 
                {
                    //echo 'List of Posts for ' . user->user_firstname . ' ' . $user->user_lastname;
                    while ($my_query->have_posts()) : $my_query->the_post(); 

?>

Answer 1

Hey use this to grab all users excluding users with ID - 1,2,4

$blogusers = get_users(array('exclude' => array(1,2,4)));

Note -

The function get_users_of_blog() is depricated, so it'd be good idea to use get_users() function which supports excludeing of users by their IDs.

Answer 2

To exclude authors you add a minus sign in front of the user id. So in your case it could look like this:

$args=array(
    'author' => '-2, -3, -4', //excludes users with id 2, 3 and 4.
    'post_type' => 'post',
    'post_status' => 'publish',
    'posts_per_page' => 1,
    'ignore_sticky_posts'=> 1,
);

Read more in the codex