Drupal 8 - Get absolute path of a file

if ($wrapper = \Drupal::service('stream_wrapper_manager')->getViaUri('public://myfile.txt')) {
    $realpath = $wrapper->realpath();
    $output=$realpath;
}

Drupal

About the author

Xuan Ngo is the founder of OpenWritings.net. He currently lives in Montreal, Canada. He loves to write about programming and open source subjects.