Mads,
Constructors yes, destructors no.
You'd use a class constructor in PHP the same as you would in C or Java; make it accept some required arguments and/or optional arguments, then have it set your class level variables, and perhaps create database connections, etc, etc, etc. One thing that is important to note though, child classes do not call their parent's constructor automatically, you must call it explicitly.... and of course the child's constructor is the logical spot to do that🙂 T
here are few good articles/tutorials on OOP in PHP in the Articles section of this site which I suggest you read as they give a relatively strong intro to PHP OOP. HTH.
Geoff A. Virgo