Global Variables vs. Local Variables

Question

Okay, I\'m not sure I\'m understanding this concept properly (I\'m learning PHP). If I understand correctly: Global variables can be referenced anywhere in the same document

Answer 1

If you use only global vars, you'll need to give a new name to every new counter, haha.

The visibility of vars is needed for encapsulation: variable can be affected only by object that you want to have access to it. For example:

class Person{
  private $_money;
  public function rob(){
    return $this->_money;
  }
}

Only object of class Person can operate his money, so, if you want them, you have to get mask and gun.