Refresh Magento Cache Programmatically

When writing processes to automate some of Magento’s normally laborious tasks, perhaps for a product-import script, a mass attribute update script, category import, or inventory adjustment, keep in mind that you may have to refresh some kind of cache — especially when working with attributes. If you are encountering quirks or inconsistencies with your data, try these:

• Rebuild Catalog Index

  Mage::getSingleton('catalog/index')->rebuild();

• Rebuild Flat Catalog Product

  Mage::getResourceModel('catalog/product_flat_indexer')->rebuild();

• Inventory Stock

  Mage::getSingleton('cataloginventory/stock_status')->rebuild();

For more cache refreshes, such as:

• Catalog Rewrites
• Layered Navigation Indices
• Product Image
• Search Index

… please refer to the source of this knowledge http://www.magentocommerce.com/boards/viewthread/43238/#t156277