Magento 1.9: Cannot redeclare Mage class

Question

I am trying to copy my categories from the old site to the new one it's on different domains but it shares the same hosting server that's why i use the real path.

i already know how to get the categories and how to add them.

the problem here is that i declare the Mage class from domain and get the categories with this code:

$mageFilename = '/chroot/home/stagingv/staging.vatrin.com/html/app/Mage.php';
include($mageFilename);

Mage::init();
Mage::app()->setCurrentStore(1);


$_helper = Mage::helper('catalog/category');
$_categories = $_helper->getStoreCategories();

but when i'm trying to call the Mage class from the new domain with this code in the same page to add the categories to the new domain:

$mageFilename = '/chroot/home/stagingv/gostorestaging.vatrin.com/html/app/Mage.php';
include($mageFilename);

Mage::init();

it return this error:

Fatal error: Cannot redeclare class Mage in /chroot/home/stagingv/gostorestaging.vatrin.com/html/app/Mage.php on line 61

of course i can't use the first one when adding it will add the new categories on the old domain and i don't need that. how i can solve it or any better solution i appreciate?

UPDATE

This is my code:

<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
//header('Content-type: text/plain; charset=utf-8');
error_reporting(E_ALL);
$mageFilename = '/chroot/home/stagingv/staging.vatrin.com/html/app/Mage.php';
include($mageFilename);

Mage::app()->setCurrentStore(1);
// this what get all categories
getListOfCats();



$mageFilename = '/chroot/home/stagingv/gostorestaging.vatrin.com/html/app/Mage.php';
include($mageFilename);

Mage::app();

// this what get all categories after changing the mage file.
getListOfCats();

function getListOfCats() {   
    $_helper = Mage::helper('catalog/category');
    $_categories = $_helper->getStoreCategories();
    $currentCategory = Mage::registry('current_category');
    $listCats = array();
    $model = Mage::getModel('catalog/category');
    if (count($_categories) > 0) {
        foreach($_categories as $_category) {
            $listCatsTemp = array();
            $listCatsTemp['id'] = $_category->getId();
            $listCatsTemp['name'] = $_category->getName();
            $listCatsTemp['child'] = array();
            $_category = $model->load($_category->getId()); 
            $_subcategories = $_category->getChildrenCategories();
            if (count($_subcategories) > 0) {
                $listSubCats = array();
                foreach($_subcategories as $_subcategory) {
                    $listSubCatsTemp = array();
                    $listSubCatsTemp['id'] = $_subcategory->getId();
                    $listSubCatsTemp['name'] = $_subcategory->getName();
                    $listSubCatsTemp['child'] = array();
                    $_category1 = $model->load($_subcategory->getId());
                    $_subcategories1 = $_category1->getChildrenCategories();
                    if (count($_subcategories1) > 0) {
                        $listSubSubCat1 = array();
                        foreach($_subcategories1 as $_subcategory1) {
                            $listSubSubCatTemp = array();
                            $listSubSubCatTemp['id'] = $_subcategory1->getId();
                            $listSubSubCatTemp['name'] = $_subcategory1->getName();  
                            $listSubSubCatTemp['child'] = array();
                            $_category2 = $model->load($_subcategory1->getId());
                            $_subcategories2 = $_category2->getChildrenCategories();
                            if (count($_subcategories2) > 0) {
                                $listSubSubCat2 = array();
                                foreach($_subcategories2 as $_subcategory2) {
                                    $listSubSubCatTemp1 = array();
                                    $listSubSubCatTemp1['id'] = $_subcategory2->getId();
                                    $listSubSubCatTemp1['name'] = $_subcategory2->getName();
                                    $listSubSubCatTemp1['child'] = array();
                                    $_category3 = $model->load($_subcategory2->getId());
                                    $_subcategories3 = $_category3->getChildrenCategories();
                                    if (count($_subcategories3) > 0) {
                                        $listSubSubCat3 = array();
                                        foreach($_subcategories3 as $_subcategory3) {
                                            $listSubSubCatTemp2 = array();
                                            $listSubSubCatTemp2['id'] = $_subcategory3->getId();
                                            $listSubSubCatTemp2['name'] = $_subcategory3->getName();
                                            $listSubSubCat3[] = $listSubSubCatTemp2;

                                        } // end foreach sub cat 2
                                        $listSubSubCatTemp1['child'] = $listSubSubCat3;
                                    } else {
                                        $listSubSubCat3 = array();

                                    }  // end if sub cat 2
                                    $listSubSubCat2[] = $listSubSubCatTemp1;

                                } // end foreach sub cat 2

                            } else {
                                $listSubSubCat2 = array();

                            }  // end if sub cat 2
                            $listSubSubCatTemp['child'] = $listSubSubCat2;
                            $listSubSubCat1[] = $listSubSubCatTemp;

                        } // end foreach sub cat 1

                    } else {
                        $listSubSubCat1 = array();

                    }  // end if sub cat 1
                    $listSubCatsTemp['child'] = $listSubSubCat1;
                    $listSubCats[] = $listSubCatsTemp;

                } // end foreach sub cat

            } else {
                $listSubCats = array();

            }  // end if sub cat
            $listCatsTemp['child'] = $listSubCats;
            $listCats[] = $listCatsTemp;

        }  // end foreach cats

    }  // end if cats  
    echo '<hr>';
    echo '<pre>';
    print_r($listCats);
    echo '</pre>';
}
?>

Thanks in Advance.

Answer 1

If you're using Mage::app() anyway then you don't need Mage::init() too. Mage::app() calls init so maybe that's why you're getting the error.

From app/Mage.php:

public static function app($code = '', $type = 'store', $options = array())
   {
   if (null === self::$_app) {
       self::$_app = new Mage_Core_Model_App();
       self::setRoot();
       self::$_events = new Varien_Event_Collection();
       self::_setIsInstalled($options);
       self::_setConfigModel($options);

       Varien_Profiler::start('self::app::init');
       self::$_app->init($code, $type, $options);
       Varien_Profiler::stop('self::app::init');
           self::$_app->loadAreaPart(Mage_Core_Model_App_Area::AREA_GLOBAL, Mage_Core_Model_App_Area::PART_EVENTS);
       }
       return self::$_app;
   }

Note: I couldn't duplicate your problem regardless of how I called Mage::app() or Mage::init().