public StreamWrapperInterface::realpath()
Returns canonical, absolute path of the resource.
Implementation placeholder. PHP's realpath() does not support stream wrappers. We provide this as a default so that individual wrappers may implement their own solutions.
string Returns a string with absolute pathname on success (implemented by core wrappers), or FALSE on failure or if the registered wrapper does not provide an implementation.
public function realpath();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!StreamWrapper!StreamWrapperInterface.php/function/StreamWrapperInterface::realpath/8.1.x