Static variable in a class method

I have a class method which declares a static variable within.However, across all the instances of the class, the current value on that variable replicates. Is it the intended functionality? Example: class A { public function foo() { static $i=0; $i++; }}$obj1 = new A();$obj1->foo(); //$i = 1 $obj2 = new A();$obj2->foo(); //$i = 2 where I think it should be 1, becaue it's a new instance.