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By making the self reference explicit, you're free to refer to any object by that self reference. 1) methods are just functions that happen defined in a class, and need to be callable either as bound methods with implicit self passing. For a language-agnostic consideration of the design decision, see what is the advantage of having this/self pointer mandatory explicit?.

To close debugging questions where op omitted a self. Self - this refers to the current class name. So self::baz() is the same as foo::baz() within the foo class (any method on it).

Dec 31, 2009the "self" is the conventional placeholder of the current object instance of a class.