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<?php
/**
 * Debug SOAP requests
 */

$client = new SoapClient(
'http://example.loc/index.php/api/v2_soap/?wsdl'
);

// Set yourself debug session cookie, for Xdebug and Phpstorm 
$client->__setCookie('XDEBUG_SESSION', 'PHPSTORM');

$session = $client->login('user', 'key');

$productId = '123456';

$stockItemData = array(
'qty' => '123',
'is_in_stock ' => 1,
'manage_stock ' => 1
);

$result = $client->catalogInventoryStockItemUpdate($session, $productId, $stockItemData);