Updating Stock Levels in Magento from a CSV - php

Question

I have a script that will update the stock quantities in Magento based on matching a SKU. This works fine as long as the headings in the CSV match the fields in Magento they are updating e.g.
sku,qty
ABC123,20
ABC124,20
However my source CSV the headings are named "product id" and "quantity" e.g.
product id,quantity
ABC123,20
ABC124,20
How would I remap the array key name so as the import would work?
require_once '../app/Mage.php';
umask(0);
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);
$count = 0;
$file = fopen('/home/public_html/mysite/csvs/my.csv', 'r');
while (($line = fgetcsv($file)) !== FALSE) {
if ($count == 0) {
foreach ($line as $key=>$value) {
$cols[$value] = $key;
}
}
$count++;
if ($count == 1) continue;
#Convert the lines to cols
if ($count > 0) {
foreach($cols as $col=>$value) {
unset(${$col});
${$col} = $line[$value];
echo ${$col};
}
}
//print_r($cols); die();
// Check if SKU exists
$product = Mage::getModel('catalog/product')->loadByAttribute('sku',$sku);
if ( $product ) {
$productId = $product->getId();
$stockItem = Mage::getModel('cataloginventory/stock_item')->loadByProduct($productId);
$stockItemId = $stockItem->getId();
$stock = array();
if (!$stockItemId) {
$stockItem->setData('product_id', $product->getId());
$stockItem->setData('stock_id', 1);
} else {
$stock = $stockItem->getData();
}
foreach($cols as $col=>$value) {
$stock[$col] = $line[$value];
}
foreach($stock as $field => $value) {
$stockItem->setData($field, $value?$value:0);
}
$stockItem->save();
unset($stockItem);
unset($product);
}
echo "<br />Stock updated $sku";
}
fclose($file);

Answer 1

You can try the following article which works great:
http://www.blog.magepsycho.com/updating-product-qty-in-magento-in-an-easier-faster-way/
which is simply based on raw sql queries and very fast even for millions of sku's qty updates.
Thanks