Adding new columns for posts in the WordPress admin panel

You can place this code in your functions.php or in your WordPress plugin

// manage_cars_posts_columns - instead of cars enter your post type
add_action('manage_cars_posts_columns', 'custom_colums_extended');
add_action('manage_cars_posts_custom_column', 'custom_colums_extended_data', 5, 1); // 1 - how many parameters we pass function
add_filter('manage_edit-cars_sortable_columns', 'custom_colums_extended_sort');
add_action('pre_get_posts', 'custom_colums_extended_sort_order');

function custom_colums_extended($columns) {

    //get the data of the columns

    $title = $columns['title'];
    $date = $columns['date'];

    //save the data of the columns
    $columns['title'] = $title;
    $columns['date'] = $date;

    //add a new column with the key price
    $columns['price'] = esc_html__('Price', 'myplugin');

    return $columns;

}

function custom_colums_extended_data($column, $post_id) {

    $price = get_post_meta($post_id, 'price', true);

    if ($column == 'price') {
        echo esc_html($price);
    }

}

// Add sorting for the Price column

function custom_colums_extended_sort($columns) {

    $columns['price'] = 'price';

    return $columns;

}

function custom_colums_extended_sort_order($query) {

}