programmatically reindex magento

If you want to reindex your magento index management programmatically than simple follow below step.

                                                               

For Product Attributes 
$reindex = Mage::getModel('index/process')->load(1);
$reindex ->reindexAll();

For Product Prices 
$reindex = Mage::getModel('index/process')->load(2);
$reindex ->reindexAll();

For Catalog URL Rewrites                     
$reindex = Mage::getModel('index/process')->load(3);
$reindex ->reindexAll();

For Product Flat Data
$reindex = Mage::getModel('index/process')->load(4);

$reindex ->reindexAll();

For Category Flat Data  
$reindex = Mage::getModel('index/process')->load(5);
$reindex ->reindexAll();

For Category Products
$reindex = Mage::getModel('index/process')->load(6);
$reindex ->reindexAll();

For Catalog Search Index  
$reindex = Mage::getModel('index/process')->load(7);

$reindex ->reindexAll();

For Stock Status 
$reindex = Mage::getModel('index/process')->load(8);
$reindex ->reindexAll();

For Tag Aggregation Data
$reindex = Mage::getModel('index/process')->load(9);
$reindex ->reindexAll();

             OR

if you want all index than use below code.

for ($ga = 1; $ga <= 9; $ga++) {
    $reindex = Mage::getModel('index/process')->load($ga);
    $reindex ->reindexAll();
}