Clear cache/reindex

clear_cache.php

<?php
include 'app/Mage.php';
Mage::app();

// clear cache
Mage::app()->removeCache('catalog_rules_dirty');

// reindex prices
Mage::getModel('index/process')->load(2)->reindexEverything();
/*
1 = Product Attributes
2 = Product Attributes
3 = Catalog URL Rewrites
4 = Product Flat Data
5 = Category Flat Data
6 = Category Products
7 = Catalog Search Index
8 = Tag Aggregation Data
9 = Stock Status
*/

// Recreate a single index programmatically
Mage::getModel('index/process')->load(Mage_Catalog_Helper_Product_Flat::CATALOG_FLAT_PROCESS_CODE, 'indexer_code')->reindexEverything();