Random Thoughts : Programmatically Assign Products from one category to other category in Magento

Programmatically Assign Products from one category to other category in Magento

Create a PHP script file in root directory of Magento directory structure and put below code in it.
Adjust category from ID and to ID according to need.
Execute script.

 To
//  5 => 10
$from = 5;
$to = 10;
 
$category = Mage::getModel('catalog/category')->load($from); 
 
$productCollection = $category->setStoreId(1)->getProductCollection();
 
foreach($productCollection as $_product) {
  $product = Mage::getModel('catalog/product')->load($_product->getId());
 
  $newCategories = $origCats = $product->getCategoryIds();
  if(!in_array($to, $origCats)) {
    $newCategories = array_merge($origCats, array($to));
    $product->setCategoryIds($newCategories)->save();
    echo 'Assigned -- ' . $product->getId() . '
';
  }
}
echo 'Completed Execution!!!';
?>