Using Magento API to create categories

categories-api.php

<?php

class Categories
{
	private $client;
	private $session;
	private $tree;
	private $categories;

	public function __construct()
	{
		$this->client = new SoapClient('http://whitemediadev.com/shell-med/api/soap?wsdl');
		$this->session = $this->client->login('login', 'password');
		$this->tree = $this->client->call($this->session, 'catalog_category.tree');
	}

	public function getCategories()
	{
		if (!$this->categories) {
			$this->categories = array();
			foreach ($this->tree['children'][0]['children'] as $key => $value) {
				$this->categories[$value['category_id']] = $value['name'];
			}
		}
		return $this->categories;
	}

	public function addCategory($s)
	{
		$parentId = $this->tree['children'][0]['category_id'];
		$this->client->call($this->session, 'catalog_category.create',
			array(
					$parentId,
					array(
						'name'=> $s,
						'is_active'=>1,
						'include_in_menu'=>1,
						'available_sort_by'=>'position',
						'default_sort_by'=>'position'
						)
				));
	}

	public function isExists($s)
	{
		foreach ($this->getCategories() as $key => $value) {
			if ($s==$value) return true;
		}
		return false;
	}
}

$categories = new Categories;
$importCategories = explode(PHP_EOL,file_get_contents('db/categories.csv'));
foreach ($importCategories as $key => $value) {
	if ($categories->isExists($value)) {
		echo $value.PHP_EOL;
	}
	else {
		$categories->addCategory($value);
	}
}

db/categories.csv

can you attach here its sample