[Lain]

They'll grow giant, and roll over you. And then they'll eat smashed humans with grass sauce.

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OT: I've done only a small amount of PHP, so excuse my confusion, but what exactly does the operator -> do?
is it similar to Java's .add() ?

Well, $this is referring to the parent class, -> is used for referencing variables and functions within the class.

For example, in the code above, I have the variable/array called $cart, I'm giving the variable $potato the value stored in the $cart variable.

PHP Code:

$potato = $this->cart;

For some better explanations, I suggest checking out their documentation.