BackendUser::isAdmin() 

\nn\t3::BackendUser()->isAdmin(); 

Checks whether the BE user is an admin. Earlier: $GLOBALS['TSFE']->beUserLogin

\nn\t3::BackendUser()->isAdmin();
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| @return bool

Source Code 

public function isAdmin()
{
	$context = GeneralUtility::makeInstance(Context::class);
	return $context->getPropertyFromAspect('backend.user', 'isAdmin');
}
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