Inheritance, constructor, destructor etc

Why not make by required inheriting of all new base classes from PEAR (may be excluding factory)? I see there is a some classes, which have no parent... Well, we allow that these classes do not require the сonstructor/destructor mechanism... But how to be with derived classes, which can be realized in the future, and which needs it? And plus the mechanism of error handling, which can appear another... And still, IMHO would be correct, that each class had the own constructor, even if it will contain only one call of the constructor of a parent. It will allow to avoid some tangle, what constructor be call: for example: PEAR (have constructor) class1 (have constructor) calss2 (not have constructor) Well, I make class3 and I need constructor/destructor... class3 extends class2 { function class3 ($someparam) { // $this- > class2 ();??? It would be natural... // NOT!!! // I am forced to examine source class2, class1 and only there to detect right answer this- > class1 (); ... } ... } BR Nick Panteleeff