Magento get all categories into array

You can grab all existing categories in Magento to array, here is quick example:

$categories = Mage::getModel('catalog/category')
                    ->getCollection()
                    ->addAttributeToSelect('*')
                    ->addIsActiveFilter();
		
	$all = array();
	foreach ($categories as $c) {
	   $all[$c] = $c->getName();
	}
	return $all;
    }
    ```