create_category.php

<?php 
  require_once 'app/Mage.php';
  Mage::app();

  // $parent_category = new Mage_Catalog_Model_Category();
  // $id = $parent_category->getId();
  // print_r(id);

  // $category = Mage::getModel('catalog/category');
  // $category->load(7); // set parent to be root category
  // print_r($category->getPath());
  //     ->setName('Classic Rock')
  //     ->setIsActive(1)
  //     ->save();

  function createSubCategory($parentId, $categoryName, $isActive) {
    $parent = Mage::getModel('catalog/category');
    $parent->load($parentId);
    $parentPath = $parent->getPath();

    $category = Mage::getModel('catalog/category');
    $category->setPath($parentPath)
      ->setName($categoryName)
      ->setIsActive($isActive)
      ->setData('include_in_menu', 0)
      ->save();    
  }
  $dir = new DirectoryIterator("./csvfiles");
  foreach ($dir as $fileinfo) {
      if (!$fileinfo->isDot()) {
          $fname = $fileinfo->getFilename();
          $basefname = basename($fname, ".csv"); 
          $parentId = intVal($basefname);
          $fp = fopen("./csvfiles/" . $fname, "r");
          while($line = fgetcsv($fp)) {
              $categoryName = $line[0];
              createSubCategory($parentId, $categoryName, 1);
          }
          fclose($fp);
      }
  }
  // $parentId = 112;
  //// open the file
  // $fp = fopen("112.csv", "r");
  // while($line = fgetcsv($fp)) {
  //   $categoryName = $line[0];
  //   createSubCategory($parentId, $categoryName, 1);
  // }
  // fclose($fp);
?>