Programatically Re-indexing Magento Indexes

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<?php

// Specifically getting catalog_url indexer, returns Mage_Index_Model_Process
$catalog_url_rewrite_process = Mage::getSingleton('index/indexer')->getProcessesCollection()                                                                                                                                                
                                                                  ->addFieldToFilter('indexer_code', 'catalog_url')                                                                                                                         
                                                                  ->getFirstItem();                                                                                                                                                         
 
// Can use reindexAll(), or reindexEverything which checks dependencies, and returns reindexAll()                                                                                                                                                                                                                                           
$catalog_url_rewrite_process->reindexEverything();