FrontendUser::getCurrentUserUid() 

\nn\t3::FrontendUser()->getCurrentUserUid(); 

Get UID of the current frontend user

$uid = \nn\t3::FrontendUser()->getCurrentUserUid();
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| @return int

Source Code 

public function getCurrentUserUid()
{
	if (!($user = $this->getCurrentUser())) return null;
	return $user['uid'];
}
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