Export Categories Magento

 <?php
  //Export Categories Magento
//Upload this file in root and access from url.
//Exported file will be stored in var/import

    define('MAGENTO', realpath(dirname(__FILE__)));
    require_once MAGENTO . '/app/Mage.php';
    Mage::app();

    $category = Mage::getModel ( 'catalog/category' );
    $tree = $category->getTreeModel ();
    $tree->load ();

    $ids = $tree->getCollection ()->getAllIds ();

    if ($ids) {
        $file = "var/import/catwithid.csv";
        file_put_contents($file,"catId, catName\n");
        foreach ( $ids as $id ) {
          $string = $id . ', ' .$category->load($id)->getName() . "\n";
            file_put_contents($file,$string,FILE_APPEND);
        }
    }
   
    ?>