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Magento 2: How to get root directory path of your project programatically?

To get root directory path in magento 2 use following code:
$objectManager = \Magento\Framework\App\ObjectManager::getInstance();        $directory = $objectManager->get('\Magento\Framework\Filesystem\DirectoryList');
echo $rootdirPath  =  $directory->getRoot();
using following code you can get the other directories path also like:
echo $mediadirPath  =  $directory->getPath('media');
echo $vardirPath  =  $directory->getPath('var');
echo $pubdirPath  =  $directory->getPath('pub'); 
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