When to use self over $this?

Question

In PHP 5, what is the difference between using self and $this?

When is each appropriate?

Answer 1

According to http://www.php.net/manual/en/language.oop5.static.php there is no $self. There is only $this, for referring to the current instance of the class (the object), and self, which can be used to refer to static members of a class. The difference between an object instance and a class comes into play here.