Magento – Magento SOAP v1 – updating product by SKU

finally I found a solution

$client = new SoapClient('http://example.com/index.php/api/soap/?wsdl');    
$session = $client->login('xxxx', 'xxxxx');

 // $productInfo is array which contains all product sku and its quantities which will update to another server 

 $productInfo = array( 
                array('sku'=>'sku1','qty'=>'50000'),
                array('sku'=>'sku2','qty'=>'110'),
                );

$start = microtime(true);
foreach($productInfo as $product )
{
    $calls[] = array('product_stock.update', array($product['sku'], array('qty'=>$product['qty'])));
}

  /* 2 products will go in one request to another server for product   update   stock data(in my case quantities) using SOAP API multiCall method 
 IF YOU HAVE LOTS OF PRODUCT FOR UPDATE TO ANOTHER SERVER THEN YOU CAN REPLACE VALUE IN array_chunk function(in my case 2) 2 is total products data
   */

 foreach(array_chunk($calls, 2) as $skuChunk)
  {
     $result = $client->multiCall($session, $skuChunk);
  }
  echo $time_elapsed_secs = microtime(true) - $start; // How many times will be elapsed for this operation

Success, after some trial and error, the following code will work for drop_down, radio and checkboxes and load the options SKU.

EDIT: Going forward the only thing this is missing is that the sku values are not reloaded when clicking the edit item link from the main cart page. The script will fire on the first change made in the options by the user but I haven't figured out how to fire it on page load so the sku with options shows.

If someone can advise how this would be done with an example it would be much appreciated.

    </script>


    <!-- begin custom code -->
    <dl>
    <?php $options_to_sku = array();?>

    <?php foreach($_options as $_option): ?>
    <?php echo $this->getOptionHtml($_option) ?>
    <?php
    if ($_option->getType() == 'drop_down' || $_option->getType() == 'checkbox' || $_option->getType() == 'radio')
    {
    $options_to_sku["{$_option->getId()}"] = array();
    foreach ($_option->getValues() as $k => $v) 
    {
    $options_to_sku["{$_option->getId()}"]["{$v->getData('option_type_id')}"] = $v->getData('sku');
    }
    }
    ?>
    <?php endforeach; ?>
    </dl>
    <script type="text/javascript">
    $("sku-suffix-container").update("<strong>Configuration: <?php echo $this->getProduct()->getSku(); ?></strong>");
    var options_to_sku = <?php echo json_encode($options_to_sku);?>;

    $$('.product-custom-option').each(function(elm) {
    $(elm).observe('change', function() {
    var sku_suffix = '';
    $$('.product-custom-option').each(function(opt) {
    if ($(opt).value.length==0 || $(opt).checked==false) // no value selected
    return;
    var build_opt_id = $(opt).readAttribute('id').replace('select_','').replace('options_','');

    var opt_id = build_opt_id.replace(/\_.*/,'');

    if (!!!options_to_sku[opt_id]) // no option values array found
    return;

    if (!!!options_to_sku[opt_id][$(opt).value]) // no sku found matching value id
    return;

    sku_suffix += '-' + options_to_sku[opt_id][$(opt).value] // add to suffix
    });
    $("sku-suffix-container").update("<strong>Configuration: <?php echo $this->getProduct()->getSku(); ?></strong>" + (sku_suffix) + "TestText");

    console.log(sku_suffix);

    });

    });

    </script>
    <!-- end custom code -->

    <!--<dl>
    <?php foreach($_options as $_option): ?>
    <?php echo $this->getOptionHtml($_option) ?>
    <?php endforeach; ?>
    </dl>-->
    <?php endif; ?>