Is there any overhead of using a PHP Class Object vs a Static Class Method?

[xcv]

I am wanting to know if there is any extra overhead of using an Object in PHP instead of using a static method based on my examples below?Sesseion object from Session class \[code\]$session = new Session;$session->set(user_id, $uswer_id); //set session var$session->get(user_id); // get session var\[/code\]VSStatic methods from Session class\[code\]Session::set(user_id, $uswer_id); //set session varSession::get(user_id); // get session var\[/code\]