sth confused me

[eluser]vantao[/eluser]
[quote author="rogierb" date="1254248781"]Although it might have been *better* programming to initialize $config, this is now simply done by using the member in the constructor.

So basically one can use any member even if it is not defined;
Using $this->some_member_that_has_not_been_defined = "Some_value"; is allowed.[/quote]


tks for your explanation!!!
maybe this kind of usage is not friendly to newbie