Magento: copy images from one product to another

magento_copy_product_images.php

<?php
/**
 * Copy all images from $productSrc to $productDest
 *
 * @param   Mage_Catalog_Model_Product  $productSrc
 * @param   Mage_Catalog_Model_Product  $productDest
 */
public function copyProductImages(Mage_Catalog_Model_Product $productSrc, Mage_Catalog_Model_Product $productDest)
{
    $images = array();
    $baseDir = Mage::getSingleton('catalog/product_media_config')->getBaseMediaPath();
    foreach ($productDest->getMediaAttributes() as $imageAttribute) {
        /** @var Mage_Catalog_Model_Resource_Eav_Attribute $imageAttribute */
        $imageAttributeCode = $imageAttribute->getAttributeCode();
        $file = $baseDir . $productSrc->getData($imageAttributeCode);
        if (file_exists($file)) {
            if (!isset($images[$file])) {
                $images[$file] = array();
            }
            $images[$file][] = $imageAttributeCode;
        }
    }
    foreach ($images as $file => $imageAttributeList) {
        try {
            $productDest->addImageToMediaGallery($file, $imageAttributeList, false, false);
        } catch (Exception $e) {
            Mage::logException($e);
        }
    }
}