类声明中的静态与函数中的静态

Question

class A{

  static $var = true;

  function f(){

  }

}

vs

class A{

  function f(){
    static $var = true;

  }
}

There doesn't seem to be any difference. Are there any advantages of using one over the other?

Note that $var would be used in the f() function only. I understand that declaring it in the class header is required if the variable needs to be used in multiple functions

Answer 1

In the later example you may only use the var inside the f function. The other is accessible anywhere from inside the class A::var or outside A::var