column_admin

add_filter('manage_webinar_posts_columns', 'columns_head');

add_action('manage_webinar_posts_custom_column', 'columns_content', 10, 2);


function columns_head($defaults) {
    $defaults['miniature'] = 'Miniature';
    $defaults['date_du_webinaire'] = 'Date du webinaire';
    unset($defaults['date'] );
    return $defaults;
}

function columns_content($column_name, $post_ID) {
    if ($column_name == 'miniature') {
        the_post_thumbnail('thumbnail', $post_ID);
    }
    if ($column_name == 'date_du_webinaire') {
        the_field('date_du_webinaire');
    };
}