Clameurs/sites/all/modules/contrib/admin/publish_button/publish_button.install

<?php
/**
 * @file
 * Uninstall task
 */

/**
 * Implements hook_uninstall().
 *
 * Remove all the variables that are used.
 */
function publish_button_uninstall() {
  $variables = db_query("SELECT name FROM {variable} WHERE name LIKE 'publish_button_%'");
  foreach ($variables as $variable_name) {
    variable_del($variable_name->name);
  }
}