magento : how to add parameter with soap request - php

Question

I am new to Magento I tried calling a category level using the Magento SOAP API with parent category id. I used the following code:
<?php
$proxy = new SoapClient('http://domain/index.php/api/soap/?wsdl');
$session = $proxy->login('user', 'password');
$result = $proxy->call($session,'catalog_category.level');
echo json_encode($result);
?>
For the above code "Default Category" details are coming, I tried to call some other category by using the following code:
$result = $proxy->call($session,'catalog_category.level',12);
This is not working:
$arguments = array( 'parentCategory' => 12);
$result = $proxy->call($session,'catalog_category.level',$arguments);
This is also not working:
Then I tried calling category tree using following code:
<?php
$proxy = new SoapClient('http://domain/index.php/api/soap/?wsdl');
$session = $proxy->login('user', 'password');
$result = $proxy->call($session,'catalog_category.tree');
echo json_encode($result);
?>
It shows the entire category tree so it means API is working but whenever I try to pass an argument it shows server not found error.
Can anyone please tell me how to pass arguments with the request.

Answer 1

You will need to call it like
$proxy->call($sessionId, 'category.level', array(null, null, 12));
For more information about the function check class
Mage_Catalog_Model_Category_Api
function level($website = null, $store = null, $categoryId = null)
If you want to pass particular website and store you can pass it instead of null parameter.

Answer 2

i manage to get output using soapv2. but it is slow compare to soapv1 but it is giving the required out put. the code i use to pass parameter is given as below.
<?php
$proxy = new SoapClient('http://domain/index.php/api/v2_soap/?wsdl=1');
$session = $proxy->login((object)array('username' => 'user', 'apiKey' => 'password'));
$result = $proxy->catalogCategoryTree((object)array('sessionId' => $session->result, 'parentId' => '12'));
echo json_encode($result);
?>