Add a column to posts & post types lists with featured image

					<?php
// Add featured image column to posts and post types lists
function atar4u_add_featured_image_column($columns) {
    $columns['featured_image'] = __('Featured Image', 'atar4u');
    return $columns;
}
add_filter('manage_posts_columns', 'atar4u_add_featured_image_column');
add_filter('manage_pages_columns', 'atar4u_add_featured_image_column');
add_filter('manage_customposttype_posts_columns', 'atar4u_add_featured_image_column');

// Display featured image in the new column
function atar4u_display_featured_image_column($column, $post_id) {
    if ($column === 'featured_image') {
        if (has_post_thumbnail($post_id)) {
            $image = get_the_post_thumbnail($post_id, 'thumbnail');
            echo $image;
        } else {
            echo __('No Featured Image', 'atar4u');
        }
    }
}
add_action('manage_posts_custom_column', 'atar4u_display_featured_image_column', 10, 2);
add_action('manage_pages_custom_column', 'atar4u_display_featured_image_column', 10, 2);
add_action('manage_customposttype_posts_custom_column', 'wpturbo_display_featured_image_column', 10, 2);