Webservice- Get Category List with subcategory & subsubcategory in magento

Create folder with in magento like webservice
I have create file webservice/getcategories.php
getStoreCategories()

<?php
require_once '../app/Mage.php';
Mage::app();
header("Content-Type: application/json");

?>
<?php 
$_helper = Mage::helper('catalog/category');
$_categories = $_helper->getStoreCategories();
$data=array();
if (count($_categories) > 0){
?>
<ul id="nav">
<?php

$i=0;
    foreach($_categories as $_category)
{
        $_category = Mage::getModel('catalog/category')->load($_category->getId());
        $_subcategories = $_category->getChildrenCategories();
        if (count($_subcategories) > 0)
{

?>
<li>
<?php

            echo $_category->getName();
            echo $_category->getId(); 

?>
<ul>
<?php 
$j=0;    
            foreach($_subcategories as $_subcategory){
?>
<li>
<?php

                 echo $_subcategory->getName();
                 echo $_subcategory->getId();
 
 $_subsubcategories = $_subcategory->getChildrenCategories();
 
?>
<ul>
<?php
$k=0;
foreach($_subsubcategories as $_subsubcat)
{?>
<li><?php 
 echo $_subsubcat->getName();
                 echo $_subsubcat->getId();
$subsubcategory[$k]=array("subsubcatname" =>$_subsubcat->getName(),"subsubcatid"=>$_subsubcat->getId()); 
?></li>
<?php
$k++;
 } ?>
</ul>
</li> 


<?php 
$subcategory[$j]=array("subcatname" =>$_subcategory->getName(),"subcatid"=>$_subcategory->getId(),"subsubcategorylist"=>$subsubcategory); 
 
$j++;  
 
            }

?>
</ul>
</li>

<?php
        }

$data[$i]=array("catid"=>$_category->getId(),"catname" =>$_category->getName(),"subcategory"=>$subcategory);
$i++;
    }

?>
</ul>
<?php 
}


$data2 = json_encode($data);
echo $data2;
?>

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