How to check whether user logged in or not

Cakephp 3.x

if($this->request->Session()->read('Auth.User'))
{
	//user is logged in 
}
else
{
	//user not logged in 
}

Cakephp 2.x

if($this->Session->read('Auth.User'))
{
	//user is logged in 
}
else
{
	//user not logged in 
}