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!!!';
?>

Magento - Products are not showing up in frontend

Below are the basic things to check when your products are not showing up in frontend

• Are the products Enabled?

Set "Status" of the product "Enabled"

• Are the products Visible?

If the product can be sale individually, set it's "Visibility" attribute to "Catalog" OR "Catalog, Search"

• Are the products In Stock?

Set "Stock Availability" of the product "In Stock"

• Is Product in sufficient quantity to sell?

Set "Quantity" of the product to some integer greater than 0

• Are any associated products in stock?

If the product is of type complex, like a bundled or configurable product, at least one of the associated products that comprise it must be in stock and enabled 

• Are the products in the desired category?

• Are your Caches and Indices out of date?

Access System -> Cache Management and System -> Index Management menus. Re-index all the indices and Refresh all the caches.