<?php

function deleteall_help($section) {
  switch ($section) {
    case 'admin/help#deleteall':
    case 'admin/modules#description':
      return t('Deletes all nodes.');
      break;
  }
}

function deleteall_menu($maycache) {
  $items = array();

  $items[] = array(
    'path'     => 'admin/node/deleteall',
    'title'    => t('delete all'),
    'callback' => 'deleteall_deletall',
    'access'   => user_access('administer content'),
    'type'     => MENU_NORMAL_ITEM);

  return $items;
}

function deleteall_deletall() {
  $result = db_query('SELECT nid FROM {node}');

  while($data = db_fetch_object($result)) {
    node_delete(array('nid' => $data->nid, 'confirm' => 1));
  }

  db_query("UPDATE {sequences} SET id = 1 WHERE name = 'node_nid'");
  db_query("UPDATE {sequences} SET id = 1 WHERE name = 'comment_cid'");

  drupal_set_message(t('All nodes have been deleted.'));
  drupal_goto();
}