Convert a set of Magento categories to Multi-Select Attributes.

categoryToAttribute.php

<?php
/* Mage Australia - 2016-06-20 - 
   Finds Categories that match multiselect
   attribute and saves the product as that style 
*/

require_once '../app/Mage.php';
umask(0);
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);


$attributeOptions = getAttributeOptions('designer');


print_r($attributeOptions);


$products = Mage::getModel('catalog/product')->getCollection();
//->addAttributeToFilter('type_id', array('eq' => 'configurable'));

foreach ($products as $product){
        $product = Mage::getModel('catalog/product')->load($product->getId());
        #echo $product->getName();


        $cats = $product->getCategoryIds();
        $attributeIds = array();
        foreach ($cats as $category_id) {
                $_cat = Mage::getModel('catalog/category')->load($category_id) ;
                $catName = ucwords(strtolower($_cat->getName()));
                if(in_array($catName, $attributeOptions)){
                    $attributeKeys = array_search($catName, $attributeOptions);
                    echo $product->getName() . ' - ' . $catName . ' - ' . $attributeKeys . "\n";
                    $attributeIds[] = $attributeKeys;
                }
        }
        if(count($attributeIds)){
                print_r($attributeIds);
                //$product->setData('designer', $attributeIds);
                $product->setDesigner($attributeIds[0]);
                $product->save();
        }
}


function getAttributeOptions($attribute){
        $attributeInfo = Mage::getResourceModel('eav/entity_attribute_collection')->setCodeFilter($attribute)->getFirstItem();
        $attributeId = $attributeInfo->getAttributeId();
        $attribute = Mage::getModel('catalog/resource_eav_attribute')->load($attributeId);
        $attributeOptions = $attribute ->getSource()->getAllOptions(false);
        foreach($attributeOptions as $key=>$value) {
                $options[$value['value']] = $value['label'];
        }
        return $options;
}