PHP中静态属性的行为

Question

I'm trying to understand how static property works.My example:

class Model_Cart{
    static public $_a;
}

I created object of this class in different scripts. Script 1:

 Model_Cart::$_a = true;
 var_dump(Model_Cart::$_a);

Output is "true".

But if I execute second script after:

var_dump(Model_Cart::$_a)

Output is NULL.

I expected that static variable is shared beetwen all instance of class. Can you explain this behaviour?

Answer 1

You cannot share variables across requests - they would need to be either send via a POST or GET request.